I think it's because they're using FB for registration - http://news.ycombinator.com/item?id=1594596 http://news.ycombinator.com/item?id=1594596 FB no longer

I think it's because they're using FB for registration - http://news.ycombinator.com/item?id=1594596 http://news.ycombinator.com/item?id=1594596 FB no longer functions this way for me - but Quora populates my full name and pic right after entering my email address (i.e. no credential submission required).