Extrovert

A social network where you can only discover content from friends and friends-of-friends. You cannot see anything from people you aren't connected to.

Features

• Network-bound discovery. Your feed only contains posts by you, people you follow (your friends), and people they follow (your friends-of-friends). Everyone else is invisible.
• Posts: text, photos, or videos (uploads stored on disk).
• Profile pages you can fully customize. Every user can edit the HTML and CSS of their own profile page — no JavaScript allowed (scripts, on* handlers, javascript: URLs, expression(), etc. are stripped on save). Put <!--POSTS--> in your HTML to choose where your posts render.
• Social actions: follow, like, comment, share, repost.
• A custom feed algorithm built around how engagement boosts content (see below).

The feed algorithm

Candidates are pulled only from your network (self + friends + friends-of-friends). Each candidate is scored:

score = recencyBase + engagementBoosts + viewerBoosts

Boost rules (constants in src/feed.js):

Action	Effect
Follow someone because of a post (the "Follow from post" button)	BIG boost to that post (+1000)
Share a post	a little more than a like (+60)
Like a post	small boost (+30)
Comment and like a post	small boost to the post (+30)
Comment without liking	no boost to that post at all — instead the poster's other content is boosted, only for the commenter (+50)

Engagement always targets the underlying original content (a repost just surfaces content into a new network and never splits engagement). The same original surfacing both directly and via a repost is de-duplicated to its highest-ranked appearance.

Recency base: 400 * exp(-ageHours / 48), so fresh content starts high and decays.

Getting started

npm install
npm start          # http://localhost:3000

Then sign up, find someone by username on the Discover page, follow them, and your feed fills with their content and their friends' content.

Project layout

src/
  server.js        Express app, session, route mounting
  db.js            SQLite schema + query helpers (node:sqlite)
  network.js       friends / friends-of-friends visibility rules
  feed.js          the feed algorithm (scoring + boost rules)
  sanitize.js      profile HTML/CSS sanitization (no JS)
  auth.js          auth middleware
  routes/          auth, pages, posts, profile, social
  views/           EJS templates
  public/app.css   default styles
scripts/
  test.js          algorithm + sanitization unit tests (npm test)
  smoke.sh         HTTP end-to-end smoke test
  smoke_media.sh   upload + repost smoke test

Notes

• Storage is SQLite via Node's built-in node:sqlite (no native compile needed).
• Profile customization is sanitized server-side with sanitize-html plus CSS vector stripping; the sanitized result is also re-checked on render.
• To reset everything: delete data/extrovert.db and the uploads/ directory.