I actually just brought this up in another thread I think yesterday. I follow baddies around all the time, and wasn't sure if I was the only one. PokerStars keeps track of players you've searched for, so usually whenever I find someone I'll type their name in - that way, whenever I next log in I can just chain-search for all of the bad players on my list before picking a table.

It's kind of awkward when they notice but it's worth it when they call your all-in with 2nd pair