Theme: Twenty Eleven ( as a child theme )
It used to be that if I put an image or video at the top of my blog posts that image or an image of the video would appear on Facebook if I posted a URL of that blog post.
I Googled around and learned about the "feature image" feature. I tried setting one for a post with a youtube video at the top. The featured image appears in my blog post editor, but still no dice when I post the URL to Facebook. A meta tag for the og:image does not appear either. I blew my browser cache, but that did not help.
For posts where I post a youtube video I want an image representing the video to appear on Facebook, but in my post.
For posts where I just post an image at the top of my blog post, I want that image to appear in Facebook.
How can I do these two things?