I'm sensing that many people now avoid anything that resembles a 'social network', as if they tried it and are now over the whole concept. Facebook left a bad taste in a lot of mouths.

Edit: NPR's All Things Considered did a story on this exact thing a while ago: http://www.npr.org/blogs/monkeysee/2013/06/17/192718821/teen... and apparently Twitter, Tumblr, Instagram and Vine are big ones for the teens they talked to.