As a user of a very active forum (community.wanikani.com)… Please no. We don’t need any more ways to “like” things. For instance, we have this thread: https://community.wanikani.com/t/badges-like-for-a-like/16372
Personally I feel a forum is superior to social media… because things like “likes” and “favourites” and so on on Facebook and Twitter etc. feel hollow to me. I much prefer people use their words - and so while most on our forum run rampant with their likes, I am incredibly stingy with mine and save them for helpful posts.
… Just my own personal opinion on the matter, from a single user on a single forum. And even if you do implement it Discourse-wide, that will still be an option that our own admin can decide to use or not use, correct?