I think some of you are confusing "likes" with "voting".? The best forums I have used only allow a member to "like", and then to "unlike" his/her own "like".? You can't "unlike" someone else's "like".? That would be "voting".
So forums allow both on the same post:? "likes" and up/down voting.
That's fine, but I'm not sure what good it does.? Does anyone really give much weight to either in making decisions?
So, bottom line for me, spending scarce resources on more changes for "likes", "unlikes" and/or "voting" is not a good use of resources.