I would use Twitter to…

1. add local Twitterers, get to know about them, and kidnap the “profitable” ones.
2. track local tweetups, then team up with a few friends and steal laptops.
3. see what Twitter agents people are using. Find out all the iPhone and Blackberry users from my “following” list, track where they are with the real time conversations, and steal the phones.
4. follow the local “hot” twitterers, track where they’re heading for parties during the weekend, go to the parties, drug them, and…

Also, the common ones…

1. Telling you how “rich” I am, but still trying to convince my 100 (or less) followers to buy my get rich quick tutorial ebook at 3 in the morning.
2. Upload a sexy picture of some unknown erotic ladies to my profile, write 3-4 meaningless updates, having 1453 following and 2 followers and try to convince people to “see me naked” on this webcam site where I get $15US for each signup if they are actually stupid enough to do so.

Like any other communities, the bigger it gets, the more concern has to be raised on it’s security. There have already been a few criminal cases where offenders used Twitter as the tool to help them easily locate people. So, tweet wisely, my friend!