Just how pervasive is Facebook? Here's a neato visualization of "Facebook actions" developed by a group of Facebook engineers. They call it Project Palantir (yes, there's a Lord of the Rings homage in there). It's a view from space of all the data transfers on Facebook. I recommend watching it with the sound down and perhaps listening to the theme song from 2001 or Pink Floyd or something while viewing. No need for the geek speak. The pictures do the talking.
For those businesses contemplating whether to use Facebook or any of the other major social networks as a marketing channel, this just might be your tipping point.