How to remove/get rid of irrelevant +Snippet thumbnails before everybody can see them in Google+

I just learned that one of the pains bloggers that are using Blogger have to face in Google+ is the appearance of irrelevant thumbnails after readers had share their blog posts in Google+. Thumbnail images that have nothing to do with the shared blog posts were ‘chosen’ by +Snippet and some bloggers find it quite embarrassing, I suppose.
Do not blame +Snippet
Now, there’s one thing that we have