Back on the campaign trail, John McCain admitted that he didn't use e-mail. Now the Arizona Republican is the most popular member of Congress on Twitter. "I love it; it's so interactive," McCain tells Bloomberg. With more than 1.7 million followers, McCain has 46 times more friends in the Twitterverse than Missouri Democrat Claire McCaskill, another devotee of the social networking site. According to the founder of Tweetcongress.com, the number of Republican lawmakers on Twitter is twice as large as the number of Democrats.