Twitter as a Motivator?

I originally ruled out Twitter as just another crap-tastic time-waster, and it still might be. Blabbing about what you are doing in short bursts for the whole world to read screams "I'm the most important person ever!" Kinda lame. BUT, there is an interesting trend of actual utility with some of it's pawns. Here's several examples:
1. The Open Sourcer - I recently had a problem with some code on my blog. I posted on Twitter that I needed some help and the calvary came a-running. Pretty cool.
2. The Fund Raiser - Coach Adam is using it to get people to donate to a swim to raise money to fight cancer. It works!
3. The Leader - Twitter user McNitt is using it to motivate others to do the 100 pushups a day program. Very interesting how people are willfully following his cyber punishment.
4. The Self-Motivator - I've seen many others and myself posting their progress while working on a project. Many computer jobs are solitary and it is nice to get encouragement from others while working alone on something.
All other uses of Twitter are stupid and evil. Except for a few more I can think of... What are some of yours?
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