If you’re an advanced Tweeter, you’ve probably started the purging process and are now updating your account(s) to reflect changes in the House and Senate. If not, maybe this will help you get started. Or there’s always the unofficial list for the 112th Congress to make sure you don’t leave anyone out. Researchers at HP Labs have narrowed the list down to the 100 most influential members of Congress on Twitter based on an analysis of 22 million tweets. They developed an algorithm to identify “influential users,” who “not only catch the attention of their followers” but “also overcome their followers’ predisposition to remain passive,” Ethan…