Universal popularity isn't necessarily that useful. It really just matters that everyone you know is using it. Just as Facebook used the collegiate social scen

Universal popularity isn't necessarily that useful. It really just matters that everyone you know is using it. Just as Facebook used the collegiate social scene to grow, I think theres a lot of potential for a competitor to take a similar route. Find a relatively self-contained community and attack it. It wouldn't surprise me in the least if a Facebook killer eventually emerges from the university system just as Facebook did.