NASA astronaut Shannon Walker talks to the #NASATweetup group

115 days after 1st meeting, #NASATweetup rises again.

Beautiful day for a launch, #NASATweetup #sts133

Space shuttle Discovery revealed on launch pad 39A. Launch Thursday at 4:50pmET. #NASATweetup

Cool display of #NASATweetup spirit from @ocaptmycapt - she painted this on her car!

#nasatweetup gets a demo of LER outside the robotics lab.

Look who's talking! @Astro_Clay at #nasatweetup #JSC

#nasatweetup in the Press Briefing Room talking with NASA TV commentator lead Rob Navias.

#nasatweetup folks checking in at the big pool!

Coffee is kicking in. We're waking up. Hyper group, these tweeps. Btw, that's a space shuttle behind you! Ok, it's a mockup but still.

Follow @Astro_Wheels and @StationCDRKelly in space! #ISS #nasatweetup

Home to six residents today! Wonder what they're up to?

Welcome NASA tweeters to #nasatweetup at #JSC!

#NASATweetup group picture with the countdown clock and Launch Pad 39a in the background. Now -- where's Waldo?

@AstroRobonaut is all ready for the #NASATweetup.

Getting set for Earth Day #nasatweeup in DC on Sunday. Here's where we'll be.

The Doc was in! Astronaut Bobby Satcher aka @Astro_Bones (twitter name selected via a Twitter poll) talks to tweeps at #nasatweetup on his spaceflight experience.

Groovy glove. #nasatweetup tweeps get their hands into spacewalk gear!

Remember these guys? Who gets a downlinked welcome from space? #nasatweetup tweeps, of course!