I don't really like likes, either.
IF you want to agree then speak up, elaborate, set some tone or something. Just clicking an "I AGREE" button is a mindless sheeple action. What happens when someone makes a post, everyone clicks LIKE instead of replying? No conversation happens! The only people who write an actual worded post are disagreeing (the argument for a dislike button?). So, you call them trolls and the LIKE sheeple can finally join in the conversation by saying what a troll the dislike guy is or how boring things are now that he's gone.
But its worse than you think because of AI, otherwise known as Advertising Intelligence. You go picking what you like and soon you'll only see what you like. You'll be trapped inside your old likes, unable to grow, learn anything new, hear the story from the other side. Just look at utube recommended videos and I'll bet half of them are reposts of something you like, know and are bored off.
But bored is a great time to buy more! We love DLC, these days, because we like those games. We don't really like new games that are not what we like already. We don't buy things that we don't like and we can't like things that we haven't liked before.
But, lets think bigger like political elections. Say, you LIKE a rubbish candidate. You're not going to be convinced otherwise by your "team of likes" deciding you want links to the oppositions superior policy. You'll get what you know. It will reinforce what you think you know already.
So I try to imagine a positive application where instead of "likes" being used to deliver appropriate ads they can see missing gaps in your education and act as tutor which guides you though the vast amounts of useful information on the internet while developing your character and intellect, wisdom, charisma! But the cynic in me just assumes anything like this would be bought out and abused to make money with advertising. If not perusing more nefarious objectives, such as influencing public opinion.