Social media hasn't changed our capacity for social interaction
In fact, James and I have looked at the phenomenon of Facebook friends -- and here the word “friends” is weird, we should probably say “acquaintance.” We use the word “friends” but it doesn’t mean they’re really your friends. If a random Facebook acquaintance of yours expresses interest in a movie or a book or music, it doesn’t modify your own taste in those things. But, when a real friend of yours does, among your Facebook acquaintances, you are influenced and you do change. So, these fleeting, minor online interactions may not be as influential as we think. But, online interactions can indeed facilitate an influence process among people who are actually truly connected or who have meaningful relationships with each other.
Also, the person who accumulates 10,000 followers on Twitter is unlikely to be affected by everything else that everyone else is saying -- you can’t possibly be monitoring the tweets of the other 10,000. And, if the person is sending out tweets to 10,000 or 20,000 people, in a way, all they’ve done is to become a targeted broadcaster. Now, that targeting is valuable. It’s much better to send messages to people who have expressed an interest in your message, rather than broadcasting into the air, but we should be thinking about this type of interaction more as a kind of change in the way of broadcasting rather than a change in the way of social interaction."
And here's his TED Talk (which I haven't watched yet):
http://www.ted.com/talks/nicholas_christakis_the_hidden_influence_of_social_networks.html
