- Personal information from people I don't have personal relationships with.
- foursquare check-ins
- meal reports
- running statistics
- general emo
- weather reports
- Commercial announcements for events or products I'm not interested in
- Links to favorited videos or music
- References to god or political opinion
Now none of the categories I mentioned are bad in themselves. If you habitually post in one of the categories above, I will assume that most of your followers (or at least your mom) are waiting with bated breath to know things like the temperature in your home town, your breakfast menu each morning or the dozen videos you favorited today. But since I personally don't have much use for such information, I hope those I've unfollowed (who notice) won't take it personally.
I also ended up unfollowing people I didn't recognize who hadn't posted in over three months. Although they don't clutter my Twitter stream, I think its a bit disingenuous to keep following people who aren't active just because some of them will unfollow me eventually out of spite and hurt my rankings on Crap's list of top Second Life tweeps.
So that's my story. The purge continues. I feel so clean!