For the LinkedIn Share button, you look to have set the wrong API key in the JFBConnect Configuration area. Please go to the
LinkedIn Developer Area
, edit your app and get the API Key. Save that in the JFBConnect -> Configuration -> LinkedIn area. You look to have incorrectly used the OAuth User Token (or Secret).
The Pinterest button isn't displaying because JFBConnect wasn't able to find an image to use for the post. Pinterest requires an image to be able to display. It looks like you're using K2. If so, can you enable the Open Graph - K2 plugin? That should properly detect the image and hopefully make the Pinterest button work.
Google+ doesn't seem to be working because your Redirect URI is not setup properly. Can you go through our
Google+ setup guide
again? Specifically, make sure you've followed step 7-4.
I hope that helps,
Alex