Until someone figures out how to cram more than 24 hours into a day, people have a limited amount of time. Most of us don't spend 100 percent of it on the Internet. And we don't devote all of the time we do spend on the Net to social networking.
Already, by my count, there are four major social networks: Facebook, Twitter, LinkedIn, and Google Plus, with Facebook presumably consuming a disproportionate amount of all time that people spend on these sites. Might there be room for one more big-time contender?