Users can only support one or two profiles simultaneously
In his social networking in 2007 predictions Fred Stutzman claims that people will only be able to actively keep up profiles on one or two social network sites.
“We may log on to lots of sites, but we can really only actively keep personas on one or two sites. We’re not entering a future where everyone has five social networking profiles. It just isn’t gonna happen. And that’s going to hurt the industry.”