According to the White House Blog (Making A List, Checking It Twice, by Katie Stanton, November 23, 2009):
Today we’re launching a list on the official White House account on Twitter which will make it easier for people to follow U.S. Government Twitter feeds. We’ve included a variety of accounts from Cabinet Secretaries, Agencies and Departments.
The list address is http://twitter.com/whitehouse/usg.
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