I know many counterexamples, particularly people who were in their 20's, 30's and older ten years ago. MySpace and Facebook was their first introduction to the social web.
I follow a beekeeping forum, and just yesterday there was a thread about some people noticing they had been on for 10+ years. These are definitely not the young hacker crowd. That predates myspace and is literally just an example that came up yesterday, I'm sure I can find older forums.
And are you really saying that before web forums, all the way back in the very beginning of the web people weren't being social on the web by sharing links through email? Remember, email is the true killer app of the internet, the web is just a nice-to-have. :)
