Good question. Congratulations on having minimum 20 characters for a post.
The character minimum is there for a reason, if you simply agree with a post or topic, there is the like button for that.
What is the reason? Congratulations on having minimum 20 characters for a post.
Generally because it puts a barrier in front of annoying behavior.
Is it an insurmountable barrier? No. But why allow annoying behavior when you can discourage it?
It’s a fairly common thing to do, very rarely will someone who has something meaningful to say be bothered by a reasonable minimum character limit. Even in the rare case that they are it’s not a big deal to add a bit more, if it’s not worth doing then chances are your post isn’t really important.
To make sure people actually add to the conversation and not just say. “I agree”, “me too”, “good question” etc. The likes are perfect to show that kind of sentiment without clogging up topics.
I see, the ‘likes’ are a useful addition, not the only cause of short posts but I guess most of them.