I can’t say that I really know what this is about, but it sounds like it’s a medallion-hunt kinda thing except you’re looking for a person who’s popping out hints using Twitter.
Backing up, Twitter is a group text messaging service where you SMS a quick message into the number 40404, which is then broadcast to your fellow Twitter friends. For those familiar with Dodgeball, it’s basically the shout-out feature. You can also send message out to your friends using the Twitter site, AIM and other IM services, or via a bunch of other widgets people are creating for the service.
If the Least Dangerous Game sounds like fun, add the game as a friend here. They’re shooting for 50 participants and have 20 signed up so far.