It's because most of the servers are not nearly on the level of setup that a normal large-scale social network would probably need...which in turn is also becau

It's because most of the servers are not nearly on the level of setup that a normal large-scale social network would probably need...which in turn is also because a lot of them have been run by hobbyists and the like, which in turn is also because no one ever needed to scale it this high before.