App tab that lets users click to promote your app through facebook, twitter etc

Is there any public code for integrating a "social" tab in your app so that people can share with Facebook, twitter, send to a friend etc? I have seen this in other apps and its a great idea to let your app users promote the app through their own social networks.

I could code this but if something 开发者_开发百科already exists then great.

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i think you are talking about ShareKit

Its an easy to use library. Will take 30 minutes to configure that.