On January 3, 2013, William Shatner (Captain Kirk) began a series of what is quite possibly the most epic conversation ever when he asked astronaut Chris Hadfield (who was then living aboard the International Space Station) via Twitter: "Are you tweeting from space? MBB."
Fellow Star Trek cast members promptly joined in, as well as the one and only Buzz Aldrin. January 3, 2013 -- the day the internet was officially won.
[Images from the Canadian Space Agency]