There's a line from the original radio version of The Hitchhiker's Guide to the Galaxy that lives rent free in my head. Zaphod and Roosta teleport to a party and it turned out all the dancers are robots and Roosta says something like, "But there aren’t any real people here at all!" For some reason that line has been stuck in my head forever. I haven't listened to it in years. But now it basically describes much of the social web (like Reddit, etc). Anyway, Douglas Adams was a prophet.