I have seen that below the button options to like (thumbs up) or booo (thumbs down), are the words:
Users who liked this:
Unfortunately, it lists BOTH those who LIKED the post, and those who Dis-LIKED the post without separating the two.
I don’t know if this is still a work in progress, or if the line show read “Users with strong reaction to this post:”
That would include all who thumbed the post (both positive and negative).