This question is referencing Jetpack, but I've tried others too: whatever social plug in I use, I'm having trouble with the Facebook share button.
Sometimes it shares my post on Facebook as expected. Example: Press Facebook share on this post: http://govinnovator.com/2012/adam-thomas
For other posts, it shares it without a thumbnail, even though I have a featured image and even an image within the post (with display off so it doesn't show). Example: Press Facebook share on this post: http://govinnovator.com/2012/matt-leighninger
And for still other posts, it shares my main page but not that specific post. Example: Press Facebook share on this post: http://govinnovator.com/2012/jeff-tryens
Any advice? When I look at these various posts, I don't see anything different within them that would cause them to act differently so I'm really stumped.