Interesting method — run search.twitter.com feeds into a Yahoo Pipe and route that into Pligg, plus, spit a twitterfeed with a prefix back out to the mothership. Little to no code involved, but no database pivot points at the Pligg site (like usernames, tags, dates, etc.) I think.
Another Twitter-clone, but this time, create your microblogging network as one piece of a larger network of microblogging networks. Think: Ning.
Looks like a proprietary Twitter clone where you can restrict access to a given set of users.
Django comment notification via Twitter.
The last comment in this issue appears to be the instructions for filtering tags by user in django-tagging.
Blog post about django-recommender. Makes it sound more like the django-voting tie-in has a lot more sway than the common tags, but we’ll have a look at the code then, shall we?
A pluggable app for Django that retrieves recommendations (say, users you might want to follow) based on common tags used in the django-tagging app.