The "Likes" are coming from Facebook, and started after upgrading to 2.8 (in fact on thesame post, I had a like from just before the update that did not get turned into comments, but a like right after the upgrade did). The comment gets automatically approved, even if I've unapproved them previously.
The comment says:
"Jane Smith liked this on Facebook."
Jane Smith is the FB name with a link to the user profile page. Also, there is an email address attached to the comment:
Where "###" is the person's FB user ID.
That doesn't seem like an email from FB, as I don't think FB would use example.com for even anon routing, but I could be wrong.
There doesn't seem to be any setting to disable this, though I do have "comments" from Facebook enabled, there is no mention of this functionality for likes.
The FAQ mentions edits you can make to add something like this, but I have not made any edits (and couldn't find that code block when I went searching).
Is this a bug or a feature? Is there a way to turn this off without turning off all comments?