Apart from my security concerns I noted elsewhere, I have one major question why facebook? Why not google plus? why not twitter? Why not forgo the social networ

Apart from my security concerns I noted elsewhere, I have one major question why facebook? Why not google plus? why not twitter? Why not forgo the social network douchebaggery and just check my contact list? Anyway, still love the idea, but until I can use it without facebook (or any other "special" network for that matter) it just isn't happening.