The Miami Herald reported Wednesday that there's a Chad Pennington imposter tweeting on Twitter. The quarterback's supposed account talked about various meals and get-togethers with teammates, according to the story. Pennington said he isn't a member of any social networking websites.But what about other prominent South Florida athletes?Dolphins defensive end Matt Roth has a Twitter account, along with Marlins Dan Uggla, Hanley Ramirez, and Jeremy Hermida. Heat players lead all Miami profe