I put any video from youtube in my blog,
later i share this video in facebook
but in facebook does not appear the thumbnail of the video, always shows the gravatar from the blog.
I would like that, in the share from the blog to the facebook, appearing the thumbnail of the video and not the gravatar.
It happens only in videos(in my case)..
We have no control over what displays at Facebook’s end of things. Are you using Publicize? If so see here and note that videos do not appear to be addressed in the support documentation:
Only the first five images uploaded to a post (direct inclusion/gallery/slideshow) will be sent to Facebook. The images size has to be at least 200 x 200 pixels.
To select which image will be used for things like Facebook Publicize, you can use a theme that supports featured images. If a featured image isn’t set or your theme doesn’t use featured images, then the code tries to pick the first image in the post or page. If no image is found, then the blavatar is used.