Another techie goes to Washington: Twitter CEO Dick Costolo will join a presidential advisory committee.Last night, President Obama announced that he will name Costolo to the National Security Telecommunications Advisory Committee (NSTAC). Costolo has been CEO of Twitter since October, when he took over from co-founder Evan Williams. Obama will also add David DeWalt, McAfee president and Scott Charney, a corporate VP at Microsoft's Trustworthy Computing Group.