Exactly. Facebook fills a certain need reasonably well at the moment, and it's massive because of the network effect. But I have no difficulty imagining much better things arriving in the next 5-10 years. Same deal with Twitter.

All the successful "social" stuff captures and defines how we're using technology now, but that changes very quickly.

I give bookface about 5 years. I deleted my account last year, as have many of the tech saavy people I know. Looking at current feeds when my friends and family log in, I see nothing but spam and ads. Not quite sure what will replace it, but signs clearly point toward a replacement.