Plenty of comedians love Twitter; some hate it. But even legendary stand-up comic Bill Cosby is online, grabbing hold of various social networks, including Facebook, Mashable, MySpace, UStream, 12seconds, Cinch, Vimeo and BlogTalkRadio. Here is his brief explanation about why he "Himself" is using his own Twitter account @BillCosby. He has more than 710,000 followers currently. What are you waiting for? Join the Cos online. Roll it!