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[f] Login with Facebook
In what world is Facebook required for this kind of thing?
>Ready? Just click the button below to start playing!
[f] Login with Facebook
In what world is Facebook required for this kind of thing?
So, the answer to your question is: "this world."
I suspect that the Facebook market penetration is high enough in their target demographic as to make this the most effective way for them to go. Sure, they could provide some secondary log-on technique for the non-Facebook-using minority, but would it really be worth the additional customer support headaches?
As to customer support headaches: they're running an entire custom-built web game. Login problems would be the least of their difficulties, support or technical.
So, the lowest-friction way to authenticate users still cuts out 75-85% of people on the Internet.
Edit: Not to mention everyone under thirteen.