meta tags / facebook don't show images

Hello, I’m very happy with this theme, is beautiful… but i have a problem with images when I try to share a post on facebook.
The size of featured or post image is bigger than 200×200, I have tryed two different plugins to fill the og meta tags and three different facebook-auto-poster plugins and I have also pasted the link directly on facebook, but I can’t get the image in the facebook timeline, only the title and a blank ‘terrifying’ ?? square.
any idea to fix it?
Thank you!