I tested the plugin in my testsite http://www.expo2015-italy.com/appshop/?lang=en I invite to look at the carousel carefully.
You will see that in the Slide "Puzzle Aisha" you will read in the excerpt "Share on Tumblr" even though I checked the "Disable buttons on excerpts".
I reset the plugin 3 times but nothing still there. If I let the button shown they mess in this carousel.
2- Can you say me what is the facebook app ID? Thank you vrey much, indeed.