I find myself at a crux because I do not see an option for this but I think it would be a viable option. Yay? Nay?
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You can dislike a thread, and as for disliking posts, that just doesn't make sense. All liking a post does is bump it up in the thread as if you replied to it, so what would unliking a post do? Bump it down to where it originally was? Nah, just as you can't take back a reply, you shouldn't be able to take back a like on a post.