To keep a theme alive here is the list of Major League Baseball players on twitter.
Is it a complete list? I doubt it, since more are joining all the time. But if you have a favorite, who doesn't happen to be a Marlin, you may find them listed. (I hope the link works. MLBlogs are notorious for disappearing.)
Do not take me posting this as an endorsement of twitter. I don't even have a personal account*. It is just for informational purposes only.
*I may soon since GameFish thinks I should. She obviously doesn't understand what I'm capable of saying.