You made a post, and than someone replies on it with arguments you really apreciate.
I think it would be awsome thing, to be able to thumb it up, or + it up or something like that, in maneur, youre saying, "I read your answer to my topic, I like it, and I apreciated it." instead of spamming polite words under topic.
Sure it can be done by writting, but in larger topics, whit multi posts, when you're scrolling, trying to follow argument, those polite words although they are ment only good, take away the flow.
Or maybe that's only me...
(this is not my invention, I saw it on other forum)