I guess I might have misunderstood the idea. It seems, for "Facebook killer" you understand "a better Facebook" or "a site similar to FB but with some stuff do

I guess I might have misunderstood the idea. It seems, for "Facebook killer" you understand "a better Facebook" or "a site similar to FB but with some stuff done better". I replied as I did, because I don't think a "Facebook killer" would be so similar to Facebook. If you ask about "Facebook but better", the only answers you'll get will always have FB as a basis. If you want to think about something that can have the power to replace Facebook, you'd be better off not thinking about it as FB but better. IMHO, you want a FB killer will be something which is explicitly different from Facebook.