If the site popped up WHO liked a post, people might actually use the feature. As it is, there's really no point to even having it.

It's well under 1%.  As in, a post with 500 views and dozens of comments will have, at most 2-3 likes.  There's absolutely nothing interesting to anyone created by someone hitting "Like" right now. So no one does.

That's because no useful information is communicated to anyone by "liking" something in the current structure.  This leads to posts like "totally! Eom" -- not a big deal, but there's little purpose to the Like button here.  Shrug.