Hello, I wrote a couple of times before, and you were very helpful, thank you.
I'm still using your White House. I have never been able to share links on Facebook and have the thumbnail show, which really limits my sharing, and makes me very sad, since I'm a cartoonist and I really need images/thumbnails to show.
For many months I have been disallowing Google to scrape my images, but recently I did allow Facebook. Yet the thumbnails still didn't appear. I have been trying 10 or 12 plugins for days, trying to get them to show, and testing in the debugger.
Now I realize that the debugger can see my icons, and see the thumbnail on my post page, and tells me it's too small, of course. I think I used css to block the WH thumb on my blog, because my full size cartoon is right there, and it doesn't make sense to have a thumbnail right on top of my fullsize image. So even though the thumb does not show on my post, the debugger can see it, and thinks that's the size I want to share.
I would like to stop the thumbs from appearing anywhere on my site, and I think this would also allow Facebook to see my REAL image. Do you have any suggestions on how to block the thumbs in the editor? I see them listed many times in features.php, and I don't want to delete the wrong ones!
Thank you with hope.