Well that’s weird, ?. Shows thumbs up on my screen and in preview post, but posts a question mark.
Very strange, when I click on the emoticons, then click on more, I only see 19 icons and none with a thumbs up, down or any other direction on my desktop computer. On my Samsung phone I do show a thumbs up icon and it seems to work.
I don't think I've seen the thumbs up on any post.