Fans of AMC's 1960s period drama "Mad Men," have created a series of Twitter accounts impersonating characters from the show's ad agency. Better check them out now: AMC lawyers have already filed legal notices with Twitter demanding their removal. Don Draper and Joan Halloway's accounts are already gone. Obviously, that's a mistake on the part of the cable channel.Star Wars creator George Lucas may not know how to make a movie anymore, but he at least he knows letting Star Wars fans live out weird fantasies by writing fan fiction and posting it on the Web will only help sell more merchandise in the end. "Mad Men" is a hit on both coasts — some say it's retro costumes are starting to impact men's fashion — it's not a Star Wars-sized hit at all and really can't afford to thumb its nose at fans willing to waste their time promoting the show. Here are some of fans' more successful Twitter impersonations below.