I appreciate it as a possibility. However, according to http://www.internetworldstats.com/stats.htm, there are 1.4B (rounded down) users of the internet. The distribution across cultures is fair. With all of the scientific research, politics, economics, etc. taking place locally, nationally, and globally at any one instant, and there isn't that much of interest on the internet? It seems implausible to me. Perhaps it's true, but it seems implausible. If anything, we should encourage people to join so we can increase the odds of a greater distribution of viewpoints and ideas. Exclusionary measures will more likely produce an insulated club house of group think.