People are use to "liking", but don't seem to understand the importance of "voting" yet. The two sound similar, but voting has a greater importance.
To give a clear example, curating comments is often handled wrong. I explained it in my recent post.
I often see someone say "Hey! I love your comment, you said it really well and I fully support your view, etc"... yet no upvote. Why? Simply because it's a new system and they don't have that new habit yet.