1.13.x branch. The cover uses .jpg, but avatar uses .jpeg. I think both should be valid.
[Solved] OG Image URL Broken
-
<meta property="og:image:url" content="http://community.nodebb.orghttp://community.nodebb.org/uploads/site-logo.png" />
This is not proper formatting.
-
I didn't know if this was intended or not, but I guess it was a bug.