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The use of social sign on buttons to get people to log into web based applications is pretty common and has become quite a norm but I am wondering if the same logic could be extended to mobile applications instead of requiring the user the sign up using an email address and password.

One of the concerns/constraints I can think about is the need to share information between the facebook app (lets assume Facebook is the social sign on method used here) but I am just curious to know why it really hasnt caught on as a one click login process in mobiles would be so useful.

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Are you talking about native mobile apps? – dnbrv Jan 3 '12 at 2:50
Yes,I was referring to native mobile apps – Mervin Johnsingh Jan 3 '12 at 2:52
There's no definitive answer here from the UX perspective as there's coding involved (the reason could be in the integration troubles). – dnbrv Jan 3 '12 at 2:55
up vote 0 down vote accepted

It is widely used, both in native and browser-based apps. But the nuances are more on the coding side of things.

See a very visual list of iOS apps' login screens, lots of them with facebook or twitter integration (or both).

Android has very tight integration with Google's Oauth by default, and all kind of sync connections can be established (Twitter, Facebook, Whatsapp, etc.) Also iOS recently integrated Twitter to their OS.

Another example: the StackExchange sites have the same Oauth login options available in the mobile version.

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Thanks for the list,awesome list there – Mervin Johnsingh Jan 4 '12 at 17:28

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