I didn't interpret her words in that manner. She seems to be suggesting that we would NOT come to a common place for *all* interactions. Ever been to a company party with your parents? You probably don't know many of the other kids - and the adults are a bit different too from the ones who came to your house for a BBQ. We all interact differently, even with the same people, when the context is different.
When I was in college there was a bar/pub that "everyone" hung out at on Friday nights. There were two guys who played Irish songs in sing-along fashion - we'd all sing and drink and otherwise socialize. But after last-call we'd all head our separate ways - until the next weekend. Sunday morning I would meet other friends at a different location to play games.
Different places for different kinds of interactions - I believe that is her point. We don't all go to FB for everything.
Even now I use other web-forums for things like car racing, or software-architecture, or other hobbies. Gosh - that's almost the design of meetup.com - a board for like minded people to find each other - and then they meet externally in a place conducive to the theme of the meetup.
Last time I saw a company on the web try to be everything - we later laughed at it. It was called AOL.