I don't think so. Like someone already said, this is a forum meant for discussions. If you agree with a poster, then you can easily just post saying so while giving your own opinion. If you're too lazy to quote them or don't have a unique opinion, then you really don't have much to add to the discussion.
The only good which can come from having likes is the ego boost one gets when people agrees with their post (which, again, is already possible However, I think the negatives are too big too ignore. I can picture a scenario where a controversial post receives a lot of likes and causes addition and unnecessary... controversy.
We'll be better off just to keep them out.







