facebook connect or whatever they call it these days, would require access to facebook.com
what I am suggestion would not require access to facebook.com
and it would allow the experience to be tailored to education.
did anything ever come from Microsoft's investment in facebook in terms of office documents?
I vaguely recall something about facebook incorporating the ability to post .docx. etc
"login API's" ... that allows a 3rd-party site to allow you to sign in for comments ... and more.