I found the culprit..The plugin called "Tweet, Like, Google +1 and Share" is the one which conflicts with your plugin.
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Do let me know if you solve the issue...
Nice catch! The problem should be solved in the next Jetpack release . You can find out more about the problem and the fix here:
https://github.com/Automattic/Jetpack/pull/14
@Videaprojaekt Thanks for letting me know. The conflict with Easy Facebook Share Thumbnail will also be fixed in the next release. See the fix here:
https://github.com/Automattic/Jetpack/pull/15