Sharekit does a great job with storyboards. ARC will be your biggest problem. You will need to go through each class in Sharekit and tell it to ignore ARC ( -fno-objc-arc - under the build steps), although you should warn that you will need to do this for 60 classes).
I personally do not think it is very difficult to integrate Facebook with their new, simpler API. And Twitter is so simple in iOS 5. Speaking, if you want more sharing services than those or can't understand how to implement Facebook or Twitter, go with Sharekit and you shouldn't have a problem.
Andrew
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