On a recent episode of Late Night with Jimmy Fallon, Jimmy and Kevin Rose (creator of Digg.com and guest of the show) decided to run an experiment to create a “Twitter Rockstar”. The idea was simple: they pick an audience member, send a “tweet” out to all of their followers linking to this audience member’s Twitter account, and announce it on TV.

Their purpose was to take an unknown and unfollowed Twitter user and expose him to millions of people with the intent of creating thousands of followers for him and increasing his popularity instantly. It worked, as he received over 10,000 followers before the show even aired.

Today, he sits at about 33,000 followers. The question is, how long did his “15 minutes of fame” really last? Let’s take a look at the conversations.

It’s been a good year for Jimmy Fallon. Since March 2008 he went from last to first in Web chatter among all other late night talk show hosts. Will his popularity continue to rise or fade as the newness wears off? He’s currently one of the most followed people on Twitter…will be interesting to check again in a few months once the new Leno and Conan shows start airing.