I’m slightly curious as to why there is a like button on here. Is it for a specific group of people? (I can’t access it; maybe it’s for more professional users.) Is it an unavailable feature? Why do we even have one if it isn’t useful?
AFAIK, it’s a built-in feature of Discourse, what Snap! uses for the forums. the forum owners here disabled it a while back, which is why some people’s profiles say they have likes, while no actual feature is to be found.
That makes sense, actually.
If you’re referring to likes in the community site, not the forum, we added those so the author can see that people like their project, and so that you can keep a list of liked projects.
When you like a project, it gets added to your bookmarks, which you can later find here:
Additionally, if you’re the author of a project that people like, you’ll see a heart in the project title bar. We don’t show who likes a project or how many people do, neither publicly not privately.
Internally, this also helps us find projects that people like.
I should’ve worded my post better. I was talking about the likes on forum posts, not the ones on projects. 
I, for a fact did see the category being set to #forum-help, but the problem to begin with was I quoting a passage of a FAQ not realizing it is not about likes on forum posts but actually likes on projects. Though the same principle does apply to liking forum posts: what would a thumbs up on some random forum post even mean?