The Falling Skies Facebook page has a new (or at least new to me) flash game on the resistance page. It's a pretty simple game that has you pointing and clicking on flying alien tweets to destroy them. There's not much else to it, though they do incorporate some smart social aspects such as requiring you to "like" the page to unlock a machine gun or to recruit five friends to unlock C4.
While I do like how they encourage adding friends and tweeting, the actual game itself is a bit too simple for any lasting value. If they added just a bit more diversity to the tweets or maybe some other kind of game mechanics then I could see fans of the show really jumping on board. As it is now, it seems like another failed attempt at creating a viral web game to promote the show.