[jonplackett]

The way facebook is different is that it isn't just a social network, it IS your online identity. The fact that they make you use your real name rather than just some username is what made it work. And what continues to make it a more permanent part of who you are digitally. Facebook login makes it even more intertwined and hard to remove.

[mikro2nd]

The fact that there are a great number of people not on Facebook whose online identity is just fine is ample refutation of this absurd claim.

And Facebook login being "necessary"?... Never used it. Never will.

[jonplackett]

I'm not saying that. Just that this is why it's been so successful - so far...