[notahacker]

Twitter arguably did that a while ago.

[swat535]

It’s one of the things I like about it.

You can only give it a heart, otherwise move on. There’s no Karma or other points.

Except for view counts etc which are useful for content creators but for the average users it doesn’t do much.

However you do see the number of likes on your comment and get notification pings so there’s that..