Twitter scored a lot of points in Washington recently when it publicly came out in support of the government's Do Not Track policy recommendation for Web companies. But that doesn't mean the social networking and micro-blogging company can rest easy. While praising Twitter for its Do Not Track commitment, Reps. Cliff Stearns (R-Fla.) and Joe Barton (D-Texas), members of the Congressional Bi-Partisan Privacy Caucus and Energy and Commerce Committee, fired off a dozen of questions Thursday to Twitter's Dick Costolo, about the company's data collection and tracking practices, especially as t...