I'm going to try not to hijack the thread for much longer - but first, a clarification - @Flynn_Smith I owe you an apology - although you've negged quite a few people for things that I personally think are questionable, I had you and someone else mixed up in terms of the 'gross-level' of reactions you were giving out. I am sorry for the confusion.
As for reactions, I think this sums it up best:
Share your words, don't just communicate in emojis. If you like what someone has said, but have nothing to add, by all means hit that like button. If you don't like what they've said, explain your point of view to further the conversation, and perhaps give other people your perspective.