But with the proliferation of such sites sprouting every day, each touting unbeatable features, people are being entrapped into fractured islands thats are isolated from each other. Each individual wants you to join his network; you dilly-dally for some time before agreeing to some of them, your membership gradually spans over multiple networking sites, you eventually lose interest and refuse continued loyalty to the sites that haven't gained critical mass, the islands run out of steam and you're finally left with networks that have a constantly dwindling user base and active accounts.
I've lost count of the social networking sites that regularly invite me to join them. They really make me sick nowadays. The only two networks I ever joined were MySpace and Orkut. And I rarely login to either of them nowadays. Good old email is still the greatest application of the Internet age. The rest are often little more than passing fads.