This is one of those times where you just have to be careful what you tweet, especially if it's inappropriate.  According to Terez Owens Triple jumper Voula Papachristou has been expelled from Greece’s Olympic team for her comments on Twitter mocking African immigrants — The 23-year-old Papachristou had tweeted that “with so many Africans in Greece, at least the mosquitoes of West Nile will eat…