I know several have been asking for them, and it's been a struggle finding a plugin that actually works, but I finally found one today!

Now below each post you will find options to Thank, Like or Dislike that post. Thank and like each give that person +1 reputation point, while a Dislike is a -1 reputation point.

Additionally you will find a new dropdown arrow under your name beside your posts that will show your stats for Thanks/Likes/Dislikes.