I try to only "like" posts that I either agree with, laugh at, or that touch me in some important way. The trouble is, most of the posts on here are funny or kind or thoughtful or whatever, and if I "liked" every post that I like, I'd seem like a suck up. (In my own mind) So, I try to keep a happy medium.
And like others have said, when I go to the trouble of writing something out and hitting that "post reply" button, it's nice to see that someone took the time to read what I wrote. Because, if I'm just talking to a brick wall, what am I doing here? I can go to FaceBook and get ignored by family!
I only give out my heart shaped box to folks who touch me in some important way too - im easy that way