You should always start (i don't like this advice any more than giving it) with any cranberry plugin testing with the capx he provides. This has helped me.. the temptation to just go head first into the plugin and plop it into your game works sometimes but often it doesn't..
The first thing people want to say is that it's the plugin.. it's broken.. but in reality sometimes how you use it in your game is just wrong. If you can replicate the same disfunction with the capx he provides then you might be onto something.. if it still doesn't work.. then maybe something else is up.
I haven't tried that plugin.. you might also consider making your life easier by not using that plugin. There is a nice "social share" plugin that Sang Ki has that I've used with fairly good success that basically uses the iOS native share feature to post to twitter facebook or even text.. This has far lower barriers and works for iOS / Android.