[bigbugbag]

So basically you are asking "tell me about those online places where I couldn't find those people who had no internet access at the time."

Internet penetration increases through time and with that more non-knowledgeable people get on board and go to the lowest common denominator, lower branches. See AOL, eternal september.

The point being that those site such as facebook and those who came before have no proper value. Value and content comes from the users, who can shift it around quite faster than expected. -edit- sorry, allow me to correct myself here, facebook has value in that it succeeded in linking real names with online profiles. Something that was unthinkable and contrary to common sense and netiquette. -/edit-

Follow the trail of 13 years old and you'll know which site is gonna succeed in the near future.