FACEBOOK: Pictures of me looking like a badass, pictures of my wife looking hot, pictures of Skeletor holding space puppies

TWITTER: I follow Hugo Chavez, Al Shabaab in Somalia, Rupert Murdoch, the Pope and Spaceflight Now (helpful when I'm up at Vandenberg). I only post things from my Kindle. My Twitter feed is insanely, delightfully irrelevant... but due to bots, I have a dozen followers.

REDDIT: Reddit is useful for dumping my leftover energy from writing, kind of like the cooling pools of a nuclear reactor. Not only that but the demographic of Reddit is precisely the target audience of Hollywood so it's been keenly useful in refining my writing to reflect my target audience. In short, Reddit is my Fight Club that allows me to refine the writing that counts to the point where it's good, rather than just vomited words on a page (most of my Reddit posts).

I am also a member of two or three smaller, topic-specific boards that have been made deliberately and forcefully invisible to Google. I'm much more sociable there.