ShareKit is a free and open source framework which will allow developers to add full sharing capabilities to their iOS app with just 3 lines of code.

Here are some key features of "ShareKit":

Supported Services:
· Delicious, Email, Google Reader, Facebook, Read It Later, Pinboard, Twitter
· New services can be submitted by anyone and dropped into your project at anytime.
· Additional services are already in development.

Supported Content:
· Share URLs, images, text, and even files. ShareKit will only display the services that can handle the content you want to share.

Offline Sharing:
· ShareKit works offline! Users can share even without an internet connection. The next time a connection is available, ShareKit will send the pending items.

Customizable UI:
· ShareKit can easily be transformed to fit the existing look of your app.

Open Source:
· Anyone can help improve ShareKit or submit new services. It is also entirely free to use and modify.