[ganjianwei]

This is likely to get traction because generally:

- people have already signed up with Facebook

- people don't trust app developers with their FB data, and don't trust app devs not to post crap to their timelines

- people hate signing up for another service again with email and password (you have to give out your email, you have to create/reuse and remember a password)

The more open question is if it will cannibalize FB logins or get incremental people to sign up with FB (people want to do this anonymously but didn't have the option and gave up).

[rhizome]

App developers have never been responsible for a leak. I literally cannot find a reference in the Google to an app company leaking user data they were authorized by FB to hold.

You know what I can find? Facebook having leaky permissions for a year and a half.

[kytmizuno]

I would hope this goes towards the iOS permission model. You would almost always login anonymously. Then pieces of information are requested on demand when a user takes action that specifically needs that information.