I think social networks and community driven websites/applications simply have a lifecycle. They all eventually crash and burn, only for a newer (note: newer is

I think social networks and community driven websites/applications simply have a lifecycle. They all eventually crash and burn, only for a newer (note: newer is not the same as better) one to grab the share of users. It's a slightly stretched analogy, but each social network is a bit like a country/state. With a long view of history, it's rare for one to last a long time. History is riddled with failed states or once grand countries that everyone thought would last forever.