@Southie if you click on the number you should be able to see who has liked your post. There is a small window that appears saying "people who clicked".
In the past, you clocked likes received. It took you to the post in the thread. So you could easily track it.
Now, you have to know a priori which post has received a like - or for the fortunate ones, the highly regarded and sought after multiple likes. Onky with that information can the liked person know who liked his or her post.