To go beyond even that I would suggest that the GP either has never used Facebook or doesn't see the value in the tool that it can be and doubtlessly is for some of its users.
Facebook, in this place and time, is the single best way to get people with different backgrounds together. People who are using Facebook just to post "I can't believe how drunk I was last night. Go [insert the football team of your choice]!" every Sunday morning are pretty much spinning their wheels. But there are tons of groups that can be used to communicate on a level of ease and width that no other technology can today. It can be used for base information or advocacy. Something as exclusive in nature as Slashdot isn't going to bring about many casual users but Facebook sure can by not limiting themselves to a small scope of interest. It can do this without the restrictive format of Twitter and without the tedium of going to dozens of websites.
There is a world of possibilities. Unfortunately most people who could use it to a better degree have dismissed it because they can't be bothered. If someone decides not to use it, that's all fine and well but it doesn't take away from the value that can be found there.