But Facebook and other social media platforms didn’t really draw many middle school students until after the iPhone was introduced (in 2007) and was widely adopted over the next few years. It’s best, then, to think about the entire period from 2007 to roughly 2012 as a brief span in which the social life of the average American teen changed substantially. Social media platforms proliferated, and adolescents began using Twitter (founded in 2006), Tumblr (2007), Instagram (2010), Snapchat (2011), and a variety of others.
