Kbird666
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seems like we can't thank or Rep. People anymore or is my post count so low I lost that priviledge :)
Don't think it exists, if you the poster of the topic you can mark a reply as answered, and you can also request a blue ribbon for someone as well, but nothing like a like/+1 or upvote exists here anymore I think, though there was a way to mark a post as helpful at one point, not sure if that's still there in any form.
Also we still have a "reward points" under our avatar which may have been related to a system that did something like that at one point, but it seems obsolete, with only only that remaining. (and almost everyone having zero)
edit: Mark as "Answered" and "helpful" are options, but only if you created the topic. If you didn't You can only Request a blue ribbon for that person from a moderator. (but no easy button to do that automatically)