social media and scale

Jason Calacanis is declaring facebook buncruptcy.

It is something I always wondered about: how much can you scale social media? How many comments can an individual follow? How many emails can an individual read and respond to? How many friend connections can you keep up on Facebook or LinkedIn before loosing control?

After a certain scale, social medial are still reciprocal but maybe not symmetrical... This could be an interesting mesure to compare social-* (media, networks, etc) platforms.