First welcome to FT!
I've already posted above why I'm not enthusiastic about a like button. Whether it's one line or not it takes up real estate and is distracting. Plus I've seen likes given to posts that gave wrong info. I'm it sure the same problem would exist even if it said informative. The other, probably most important, thing is that whether a post has likes or not is irrelevant to me. More important is, am I getting information that I deem valuable.
Cheers.