I've never found myself wanting a like button for code. It's a nice gimmick, but I don't see it providing enough value that would impact my decision to use a product providing it.
It's not all about this "Like" button. There are other things in Codebrag we think can make it worth trying: all your duties in one place (commits waiting for your review, comments and likes from other users you may want to reply to). Also it doesn't stand on your way, no tons of clicking, going through complicated lifecycles and so on.