Facebook, when asked about the filter bubble phenomenon, and whether they could provide ways for important content to be presented to people, not just stuff they or their friends "like." they said that would be harder...that they're good at getting people to spend a few more minutes on their site, but to weigh whether something should be presented because it's important or they should see it, they didn't think they could do that.
I wonder if we will need sites like facebook much longer, if we can give IP addresses to everything from phones to shoelaces with IPv6, there really isn't any reason to go thru their site.
I remember seeing the picture phone when i was a kid at Disneyland, but it never caught on, they said because people didn't want anyone looking at them, but maybe technology had something to do with it too, but anyway, i think it'll come down to what people find they're comfortable with...because they could, say, get in the car and enter "chat mode" where their friends could just talk to them...