[parano]

I'm curious - do you have any data supporting this? I see it on HN based on anecdotal evidence (or none) all the time. It would obviously have different effects on different market segments, but I would love to see some analysis on this.

[ntoshev]

No hard data, just lots of complaints when I tried it.

[calloc]

I'll provide my personal input, if a website requires a Facebook account to log in, I won't do it. I have the Facebook Apps platform turned off for a reason.