NASA’s getting Twitter-ific. Not only is astronaut Mike Massimino tweeting updates in preparation for the Hubble mission scheduled to launch Monday, in NASA’s next shuttle mission to the International Space Station in June, shuttle commander Mark Polansky is inviting followers to submit video questions via YouTube that he will answer from orbit, via Twitter. To submit a question, Polansky’s Twitter followers (about 2,300 right now, compared to Massimino’s over 200K, whoops!) should post a video question no longer