[Dudelander]

I don't know about Digg or Geocities. It might go the way of cosmo.com though. By this I mean it might get taken down because it's an unprofitable privately held business with no clear path to profitability.

If it wants to remain an ad supported platform it has a significant catch-22 to overcome: it can't attract advertisers without hiring moderators, but it can't hire moderators without attracting advertisers.

Its subscription model has been unsuccessful so far, and the revenue it generated has come at a cost to the overall quality of the platform. If Twitter continues to go down the path of user payments, like adding micro-transactions for example, I could see it going the route of Everquest. Where it will stay alive indefinitely thanks to the contribution of a small group of whales, but will never be relivent in the social media landscape.