Best approach for iOS social integration

I have recently faced up to integrate social networks with iOS.

In the past, I have done so many things that deal with social networking integration and I thought, it was quite easy thing for me.

But had no chance to work with it more than a year and now I was trying to do it and there are too much complex things which is related to this.

It was much different when I was doing in iOS 5 and FacebookSDK was upgraded too much.

Found that ShareKit have the most potential to be used but it seems like too heavy for simple integration.

Was liked to use Social.framework or iOS Facebook SDK and it also have confusion.

What happens if the social account registered in settings and Facebook app are different?

Seems like UIActivityViewController is the easiest way but seems like to have iOS specific version issues.

So I need any suggestions for experienced developers which is the best way to integrate social networking and do whatever I want.