I'm starting to see some Websites offer the option to login via Facebook. I'm curious how useful it is a feature. For example, when someone logs in, does her friend knows on Facebook that she logged in? What if there are more fields that I require than Facebook stores?
Which one would you use from the list of 13 controls?
It would save me a lot of time to buy the app from them. But I wonder if there is anything else I'm missing out (like a free version elsewhere).
My goal is to make registration/sign up quick and painless so they go through the motion while spreading the word. At the end of the process, the user will receive something (i.e. free e-book).
So it seems that there are 2 points where Facebook can help and perhaps make their friends take notice. Facebook Connect and Facebook invite friends.