1) Did you configure for Send message button Facebook Application ID?
2) As you can see from demo all work fine
follow attached image
About tags - Google + use Open Graph protocol
If the page contains Open Graph properties for the title, image, and description, they will be used for the +Snippet.
Check Google+ documentation
If in your website you do not see images, it means somethings was broken.
Need check page using Sharing Debugger
Then you can see what is wrong.