I only do it occasionally.
Wanna know why? I kinda hate having to leave a comment about it, lol. Sometimes, I really just want to give a "thumbs up" without having to specifically tell someone why their post is awesome. So sometimes, I click the button, and then remember I have to leave a comment with my name attached to it and I back right back out. I know that's silly and rather unfair considering we all love getting feedback, but I'm having an overly honest day today, so there it is.