ShareKit is an open source package for quickly adding share features to any iOS application with just 3 lines of code.

It supports popular services like Delicious, Twitter, Facebook, Google Reader, e-mail and as it’s all open source, it looks pretty simple to add new services as required.

The kit enables sharing images, URLs or files and only displays the appropriate services for the type of the content.

Oh, and, if that wasn’t useful enough it looks simple to customise the UI to match the look of your application and it works offline as well (sends the pending items when there is a connection).

I’m really impressed by this, and I hope a lot of developers choose to use it in future.