" we have gone from wanting to keep our lives private to wanting to broadcast every moment!" <--- Ironic, isn't it? For all those talk about "Privacy-this, Privacy-that", the same people are posting just about the smallest things. And unwittingly endangering their safety and family's at times with details that any prudent person would have kept private.

By the way, while social media is accepted by many to begin with MySpace and Facebook, I'd say it was already around well before that. Newsgroups/Usenet - the term "social media" wasn't used yet. But I'd say these groups qualify.