Other astronauts have joined Massimino on Twitter: Jeff Williams and Nicole Stott are tweeting from aboard space station Expedition 21. Astronaut Mark Kelly is slated to command the Space Shuttle next year, and Scott Kelly, his twin, is slated to take command of the International Space Station.
Massimino is the 138th most popular user on Twitter, ranked between #137 Richard Bacon, a self-described "minor celebrity BBC Radio Fivelive presenter," and #139 former House Speaker Newt Gingrich. 149 Twitter accounts have more than 1 million followers. By comparison, TwitDir, a Twitter directory, tracks 5.1 million "interesting twitterers."
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