> And then it's not long before you have a huge list of Facebook "friends" which include actual friends, family, extended family, bosses, ex-bosses, co-workers, etc. Now, imagine putting all of those groups of people at your dinner table and try to think of topics you'd be open to discussing among all of those disparate groups.

Incidentally, this was exactly one of the problems that Google+ was trying to solve with its "Circles" concept.