The term “social network” is of course synonymous with online networks like Facebook. But think about what you’re actual social life is like for a second. Are you really closest to the people whose items you “like” the most on Facebook? What about the people you @reply or retweet on Twitter? The people you reblog the most on Tumblr? If you’re anything like me, probably not. Instead, the best indicator of who I actually interact with socially the most in real life are the calls I make and the texts I send — it’s all mobile interaction.