diff --git a/build/engines.js b/build/engines.js
index f4f8c2a..b6e60af 100644
--- a/build/engines.js
+++ b/build/engines.js
@@ -4,11 +4,11 @@ const path = require('path');
 const fs = require('fs-extra');
 const log = require('fancy-log');
 const { minify } = require('html-minifier-terser');
-const { resolve, readFile, ENGINE } = require('./resolve');
+const { resolve, readFile, ENGINE, TYPE } = require('./resolve');
 
-const handlebars = require('handlebars');
+const Handlebars = require('handlebars');
 const HandlebarsKit = require('hbs-kit');
-HandlebarsKit.load(handlebars);
+HandlebarsKit.load(Handlebars);
 
 const slugs = require('slugify');
 const slugify = (s) => slugs(s, { remove: /[*+~.,()'"!?:@/\\]/g }).toLowerCase();
@@ -44,7 +44,7 @@ const markdownEngines = {
 function markdown (mode, input, env) {
   input = input.replace(/\{!\{([\s\S]*?)\}!\}/mg, (match, contents) => {
     try {
-      const result = handlebars.compile(contents)(env);
+      const result = Handlebars.compile(contents)(env);
       return 'æææ' + result + 'æææ';
     } catch (e) {
       log.error(e);
@@ -66,6 +66,11 @@ function markdown (mode, input, env) {
   return input ? markdownEngines[mode].render(input, env) : '';
 }
 
+function handlebars (input, env) {
+  const template = Handlebars.compile(input);
+  return template(env);
+}
+
 function stripIndent (input) {
   const match = input.match(/^[^\S\n]*(?=\S)/gm);
   const indent = match && Math.min(...match.map((el) => el.length));
@@ -88,47 +93,45 @@ const MINIFY_CONFIG = {
 
 const HANDLEBARS_PARTIALS = {
   layout:    'templates/layout.hbs',
+  page:      'templates/page.hbs',
+  post:      'templates/post.hbs',
 };
 
 module.exports = exports = async function (prod) {
+  const templates = {};
   for (const [ name, file ] of Object.entries(HANDLEBARS_PARTIALS)) {
     try {
       const contents = await readFile(file);
-      const template = handlebars.compile(contents.toString('utf8'));
-      handlebars.registerPartial(name, template);
+      const template = Handlebars.compile(contents.toString('utf8'));
+      templates[name] = template;
+      Handlebars.registerPartial(name, template);
     } catch (e) {
       log.error('Could not execute load partial ' + file, e);
     }
   }
 
-  const pageTemplateRaw = await readFile('templates/page.hbs');
-  if (!pageTemplateRaw) throw new Error('Post template was empty?');
-  try {
-    var pageTemplate = handlebars.compile(pageTemplateRaw.toString('utf8'));
-  } catch (e) {
-    log.error('Crash while loading page template', e);
-  }
-
   const revManifest = prod && await fs.readJson(resolve('rev-manifest.json')).catch(() => {}).then((r) => r || {});
 
   const helpers = new Injectables(prod, revManifest);
-  handlebars.registerHelper('import', helpers.import());
-  handlebars.registerHelper('markdown', helpers.markdown());
-  handlebars.registerHelper('icon', helpers.icon());
-  handlebars.registerHelper('prod', helpers.production());
-  handlebars.registerHelper('rev', helpers.rev());
+  Handlebars.registerHelper('import', helpers.import());
+  Handlebars.registerHelper('markdown', helpers.markdown());
+  Handlebars.registerHelper('icon', helpers.icon());
+  Handlebars.registerHelper('prod', helpers.production());
+  Handlebars.registerHelper('rev', helpers.rev());
 
   const shrink = (input) => (prod ? minify(input, MINIFY_CONFIG) : input);
 
   const result = {
-    [ENGINE.HANDLEBARS]: (source, env) => {
-      const template = handlebars.compile(source);
-      return shrink(template(env));
-    },
-    [ENGINE.MARKDOWN]: (source, env) => shrink(pageTemplate({ ...env, contents: markdown('full', source, env) })),
-    [ENGINE.OTHER]: (source) => shrink(source),
-    MARKDOWN_CONTENT: (source, env) => markdown('full', source, env),
-    MARKDOWN_PREVIEW: (source, env) => markdown('preview', source, env),
+    [TYPE.HANDLEBARS]: handlebars,
+    [TYPE.MARKDOWN]:   (source, env) => markdown('full', source, env),
+    [TYPE.OTHER]:      (source) => source,
+
+    [ENGINE.PAGE]:     (source, env) => shrink(templates.page({ ...env, contents: markdown('full', source, env) })),
+    [ENGINE.POST]:     (source, env) => shrink(templates.post({ ...env, contents: markdown('full', source, env) })),
+    [ENGINE.HTML]:     (source) => shrink(source),
+    [ENGINE.OTHER]:    (source) => source,
+
+    preview: (source, env) => markdown('preview', source, env),
   };
 
   return result;
@@ -206,7 +209,7 @@ class Injectables {
 
       contents = markdown('full', contents, data);
 
-      return new handlebars.SafeString(contents);
+      return new Handlebars.SafeString(contents);
     };
   }
 
@@ -215,14 +218,14 @@ class Injectables {
     return function (tpath, ...args) {
       const { hash, data } = args.pop();
       const value = args.shift();
-      const context = handlebars.createFrame(value || data.root);
+      const context = Handlebars.createFrame(value || data.root);
       Object.assign(context, hash || {});
 
       tpath = self._parsePath(tpath, data.root.local, 'hbs');
 
       try {
-        const contents = self._template(tpath, handlebars.compile)(context);
-        return new handlebars.SafeString(contents);
+        const contents = self._template(tpath, Handlebars.compile)(context);
+        return new Handlebars.SafeString(contents);
       } catch (e) {
         log.error('Could not execute import template ' + tpath, e);
         return '';
@@ -238,10 +241,10 @@ class Injectables {
 
       try {
         const contents = self._template(tpath, (s) =>
-          handlebars.compile(`<span class="svg-icon" {{#if size}}style="width:{{size}}px;height:{{size}}px"{{/if}}>${s}</span>`),
+          Handlebars.compile(`<span class="svg-icon" {{#if size}}style="width:{{size}}px;height:{{size}}px"{{/if}}>${s}</span>`),
         )({ size: hash && hash.size });
 
-        return new handlebars.SafeString(contents);
+        return new Handlebars.SafeString(contents);
       } catch (e) {
         log.error('Could not execute import template ' + tpath, e);
         return '';
diff --git a/build/file.js b/build/file.js
index 498cfcd..046e215 100644
--- a/build/file.js
+++ b/build/file.js
@@ -19,22 +19,16 @@ module.exports = exports = class File {
     }
 
     const file = path.parse(filepath);
-    let { base: basename, name } = file;
 
-    this.preprocessed = false;
-    if (name[0] === '_') {
-      this.preprocessed = true;
-      file.name = name = name.slice(1);
-      file.basename = basename = basename.slice(1);
-    }
+    this._basename();
 
     this.kind     = kind(filepath);
     this.type     = type(filepath);
     this.input    = filepath;                    // public/file.ext
     this.cwd      = file.dir;
     this.ext      = this.preprocessed ? file.ext : normalizedExt(file.ext);
-    this.name     = name;                        // index, fileA, fileB
-    this.basename = basename;                    // index.ext, fileA.ext, fileB.ext
+    this.name     = file.name;                        // index, fileA, fileB
+    this.basename = file.basename;               // index.ext, fileA.ext, fileB.ext
 
     const dir = this._dir(file.dir);
     if (dir) {
@@ -60,6 +54,15 @@ module.exports = exports = class File {
     ];
   }
 
+  _basename (file) {
+    this.preprocessed = false;
+    if (file.name[0] === '_') {
+      this.preprocessed = true;
+      file.name = file.name.slice(1);
+      file.basename = file.basename.slice(1);
+    }
+  }
+
   _dir (dir) {
     dir = dir.split('/');
     if (dir[0] === 'public') dir.shift();
diff --git a/build/index.js b/build/index.js
index f118963..53c8dcc 100644
--- a/build/index.js
+++ b/build/index.js
@@ -8,6 +8,7 @@ const Promise = require('bluebird');
 const fs = require('fs-extra');
 const { sortBy } = require('lodash');
 
+const getEngines = require('./engines');
 const primeTweets = require('./page-tweets');
 const pageWriter = require('./page-writer');
 const evaluate = require('./evaluate');
@@ -27,9 +28,10 @@ exports.everything = function (prod = false) {
   async function fn () {
 
     // load a directory scan of the public and post folders
-    const [ PublicFiles, PostFiles ] = await Promise.all([
+    const [ PublicFiles, PostFiles, engines ] = await Promise.all([
       loadPublicFiles(),
       loadPostFiles(),
+      getEngines(prod),
     ]);
 
     // load data for all the files in that folder
@@ -71,8 +73,8 @@ exports.everything = function (prod = false) {
     await evaluate(tasks.flat(), cache);
     await cache.save();
 
-    posts = await pageWriter(pages, posts, prod);
-    await writeIndex('dist/tweets/index.json',  posts.filter(Boolean), true);
+    const postIndex = await pageWriter(engines, pages, posts, prod);
+    await fs.writeFile(resolve('dist/tweets/index.json'), prod ? JSON.stringify(postIndex) : JSON.stringify(postIndex, null, 2));
   }
 
   fn.displayName = prod ? 'buildForProd' : 'build';
diff --git a/build/page-writer.js b/build/page-writer.js
index a538391..1639567 100644
--- a/build/page-writer.js
+++ b/build/page-writer.js
@@ -1,58 +1,105 @@
 const path = require('path');
 const Promise = require('bluebird');
 const fs = require('fs-extra');
-const getEngines = require('./engines');
-const { resolve, ROOT, ENGINE } = require('./resolve');
+const { map, uniq } = require('lodash');
+const { resolve, ROOT } = require('./resolve');
 const { siteInfo }  = require(resolve('package.json'));
 
-module.exports = exports = async function writePageContent (pages, posts, prod) {
-  const engines = await getEngines(prod);
-  const postIndex = await processPages(engines, posts, null, prod);
-  await processPages(engines, pages, posts, prod);
+module.exports = exports = async function writePageContent (engines, pages, posts, prod) {
+  const postIndex = index(posts, engines);
+  await processPages(engines, [ ...posts, ...pages ], postIndex, prod);
   return postIndex;
 };
 
+function index (posts, engines) {
+  posts = posts.filter((p) => !p.draft);
+
+  siblings(posts);
+
+  // fill in post content
+  posts.forEach((p) => { p.content = engines[p.type](p.source, pageState(p)); });
+
+  const reducedPosts = posts.map(pageJSON);
+
+  const authors = uniq(map(reducedPosts, 'author').flat()).sort((a, b) => (a.toUpperCase() > b.toUpperCase() ? 1 : -1));
+
+  const tagMap = reducedPosts.reduce((o, p) => Object.assign(o, p.tags), {});
+  const tags = Object.keys(tagMap).sort().reduce((result, tagslug) => {
+    result[tagslug] = tagMap[tagslug];
+    return result;
+  }, {});
+
+  return {
+    posts: reducedPosts,
+    authors,
+    tags,
+    latest: posts[0],
+  };
+}
+
+function siblings (posts) {
+  let first, prev, next, last;
+  for (let i = 0; i < posts.length; i++) {
+    const post = posts[i];
+    first = i > 0 && posts[0];
+    prev = posts[i - 1] || false;
+    next = posts[i + 1] || false;
+    last = i < posts.length - 1 && posts[posts.length - 1];
+
+    post.siblings = {
+      first: first && first.url,
+      prev: prev && prev.url,
+      next: next && next.url,
+      last: last && last.url,
+    };
+  }
+}
+
+function pageState (page, posts) {
+  return {
+    ...page,
+    meta: { ...page.meta, ...page },
+    page: {
+      domain: siteInfo.domain,
+      title: page.meta.title
+        ? (page.meta.title + (page.meta.subtitle ? ', ' + page.meta.subtitle : '') + ' :: ' + siteInfo.title)
+        : siteInfo.title,
+      description: page.meta.description || siteInfo.description,
+    },
+    site: siteInfo,
+    local: {
+      cwd: resolve(page.cwd),
+      root: ROOT,
+      basename: page.basename,
+    },
+    posts,
+  };
+}
+
+function pageJSON (post) {
+  return {
+    url: post.url,
+    fullurl: post.fullurl,
+    json: '/' + post.json,
+    title: post.meta.title,
+    subtitle: post.meta.subtitle,
+    description: post.meta.description,
+    date: post.dateCreated,
+    titlecard: post.titlecard,
+    tags: post.meta.tags,
+    author: post.meta.author,
+    siblings: post.sibling,
+  };
+}
+
 function processPages (engines, pages, posts, prod) {
   return Promise.map(pages, async (page) => {
-    // page = new Page(page);
 
-    var data = {
-      ...page,
-      meta: { ...page.meta, ...page },
-      page: {
-        domain: siteInfo.domain,
-        title: page.meta.title
-          ? (page.meta.title + (page.meta.subtitle ? ', ' + page.meta.subtitle : '') + ' :: ' + siteInfo.title)
-          : siteInfo.title,
-        description: page.meta.description || siteInfo.description,
-      },
-      site: siteInfo,
-      local: {
-        cwd: resolve(page.cwd),
-        root: ROOT,
-        basename: page.basename,
-      },
-      posts,
-    };
+    const state = pageState(page, posts);
+    const json = pageJSON(page);
+    const html = String(engines[page.engine](page.source, state));
 
-    const json = {
-      url: page.url,
-      fullurl: page.fullurl,
-      title: page.meta.title,
-      subtitle: page.meta.subtitle,
-      description: page.meta.description,
-      date: page.dateCreated,
-      titlecard: page.titlecard,
-      tags: page.meta.tags,
-      author: page.meta.author,
-    };
-
-    const html = String(engines[page.engine](data.source, data));
-    if (page.engine === ENGINE.MARKDOWN) {
-      json.preview = String(engines.MARKDOWN_PREVIEW(data.source, data));
-      page.content = String(engines.MARKDOWN_CONTENT(data.source, data));
-      json.content = page.content;
-    }
+    json.content = page.content;
 
     const output = resolve('dist', page.out);
     await fs.ensureDir(path.dirname(output));
@@ -62,16 +109,5 @@ function processPages (engines, pages, posts, prod) {
         prod ? JSON.stringify(json) : JSON.stringify(json, null, 2),
       )),
     ]);
-
-    return !page.draft && {
-      url: page.url,
-      json: page.json,
-      title: page.meta.title,
-      subtitle: page.meta.subtitle,
-      description: page.meta.description,
-      date: page.dateCreated,
-      tags: page.meta.tags,
-      author: page.meta.author,
-    };
   });
 }
diff --git a/build/page.js b/build/page.js
index 51cb671..7b1f895 100644
--- a/build/page.js
+++ b/build/page.js
@@ -6,7 +6,7 @@ const log = require('fancy-log');
 const File = require('./file');
 const actions = require('./actions');
 const { URL } = require('url');
-const { resolve, readFile, isCleanUrl, ENGINE } = require('./resolve');
+const { resolve, readFile, isCleanUrl, TYPE, ENGINE } = require('./resolve');
 const { isObject, isString } = require('./lib/util');
 
 const pkg  = require(resolve('package.json'));
@@ -29,9 +29,21 @@ module.exports = exports = class Page extends File {
       'dateModified',
       'classes',
       'flags',
+      'siblings',
     );
 
-    this.engine = ENGINE[this.type] || ENGINE.COPY;
+    this.engine = this._engine();
+  }
+
+  _engine () {
+    switch (this.type) {
+    case TYPE.HANDLEBARS:
+      return TYPE.HANDLEBARS;
+    case TYPE.MARKDOWN:
+      return ENGINE.PAGE;
+    default:
+      return ENGINE.OTHER;
+    }
   }
 
   _out () {
diff --git a/build/post.js b/build/post.js
index 50cbb80..52d1795 100644
--- a/build/post.js
+++ b/build/post.js
@@ -1,7 +1,7 @@
 
 const path = require('path');
 const { without } = require('lodash');
-const { resolve, isCleanUrl } = require('./resolve');
+const { resolve, isCleanUrl, TYPE, ENGINE } = require('./resolve');
 const Page = require('./page');
 const slugs = require('slugify');
 const slugify = (s) => slugs(s, { remove: /[*+~.,()'"!?:@/\\]/g }).toLowerCase();
@@ -17,6 +17,17 @@ function arrayify (input) {
 
 module.exports = exports = class Post extends Page {
 
+  _engine () {
+    switch (this.type) {
+    case TYPE.HANDLEBARS:
+      return TYPE.HANDLEBARS;
+    case TYPE.MARKDOWN:
+      return ENGINE.POST;
+    default:
+      return ENGINE.OTHER;
+    }
+  }
+
   _dir (dir) {
     // if the file name matches the postmatch pattern, then this needs to be /p/ file
     const match = this.name.match(postmatch);
@@ -61,6 +72,8 @@ module.exports = exports = class Post extends Page {
   _parse (...args) {
     super._parse(...args);
 
+    if (!this.titlecard) this.titlecard = '/tweets/titlecard.png';
+
     this.meta.tags = (this.meta.tags || []).reduce((result, tag) => {
       result[slugify(tag)] = tag;
       return result;
diff --git a/build/resolve.js b/build/resolve.js
index edf3943..91dc93b 100644
--- a/build/resolve.js
+++ b/build/resolve.js
@@ -78,13 +78,13 @@ exports.isCleanUrl = is(HBS, MD);
 
 
 const TYPE = exports.TYPE = {
-  IMAGE:      'IMAGE',
-  VIDEO:      'VIDEO',
-  HANDLEBARS: 'HANDLEBARS',
-  MARKDOWN:   'MARKDOWN',
-  SCRIPT:     'SCRIPT',
-  STYLE:      'STYLE',
-  OTHER:      'OTHER',
+  IMAGE:      'TYPE_IMAGE',
+  VIDEO:      'TYPE_VIDEO',
+  HANDLEBARS: 'TYPE_HANDLEBARS',
+  MARKDOWN:   'TYPE_MARKDOWN',
+  SCRIPT:     'TYPE_SCRIPT',
+  STYLE:      'TYPE_STYLE',
+  OTHER:      'TYPE_OTHER',
 };
 
 exports.type = dictMatch({
@@ -99,11 +99,11 @@ exports.type = dictMatch({
 
 
 const KIND = exports.KIND = {
-  PAGE:     'PAGE',
-  POST:     'POST',
-  ASSET:    'ASSET',
-  ARTIFACT: 'ARTIFACT',
-  OTHER:    'OTHER',
+  PAGE:     'KIND_PAGE',
+  POST:     'KIND_POST',
+  ASSET:    'KIND_ASSET',
+  ARTIFACT: 'KIND_ARTIFACT',
+  OTHER:    'KIND_OTHER',
 };
 
 exports.kind = dictMatch({
@@ -114,19 +114,13 @@ exports.kind = dictMatch({
 
 
 
-const ENGINE = exports.ENGINE = {
-  HANDLEBARS: 'HANDLEBARS',
-  MARKDOWN:   'MARKDOWN',
-  COPY:       'COPY',
+exports.ENGINE = {
+  HTML:    'ENGINE_HTML',
+  PAGE:    'ENGINE_PAGE',
+  POST:    'ENGINE_POST',
+  OTHER:   'ENGINE_OTHER',
 };
 
-exports.engine = dictMatch({
-  [ENGINE.HANDLEBARS]: is(XML, HBS, HTML),
-  [ENGINE.MARKDOWN]:   is(MD),
-}, ENGINE.COPY);
-
-
-
 exports.readFile = function readFile (fpath) {
   fpath = exports.resolve(fpath);
   return fs.readFile(fpath).catch((err) => {