Social

Stream Framework is a Python library, which allows you to build news feed, activity streams and notification systems using Cassandra and/or Redis. The authors of Stream-Framework also provide a cloud service for feed technology:

Pluggable app to allow Django developers to quickly add meta tags and OpenGraph, Twitter, and Google Plus properties to their HTML responses.

Django Client - Build Activity Feeds & Streams with GetStream.io

Django app for easy embedding YouTube and Vimeo videos and music from SoundCloud.

Nice looking templates for django-allauth

Django Classified

A collection of Django apps for copying things from third-party sites and services.

OpenGraph, Twitter Card and Google+ snippet tags for django CMS 3 pages

Easier sharing of Wagtail drafts

Integrated set of Django applications addressing authentication, registration, account management as well as 3rd party (social) account authentication.