Sounds like a spy to me.
Err... that thread has "likes" in it too. Is it possible you're looking at your own posts? There isn't a "like" button visible in anyone's own posts.** Please do not use the "Like" button in this thread! **
I've noticed in some other threads that there is no "like" link. e.g. https://www.sffchronicles.com/threads/45554/page-152#post-2271516
Therefore it seems possible to turn off this feature, but is it a forum feature or a thread feature?
Just thought I'd ask in case the "like" link could be turned off in the entries thread