I don't really see much use for a Like button in a discussion. It never occurs to me that I'd want to add that - I either add my two cents to the conversation or not. So, I don't really understand how that would be an improvement except to save people keystrokes, but so what.
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein