How to create a user1, user2 and 3 others like this post?
If this is already in a view -- you can do the flag/like counts by adding a relationship to the view (I'm assuming you're on Drupal 7).  Add the 'Flags: Node flag counter' relationship and select the flag you want the counts for.

Then you can add, for each piece of content in your block or page, the 'Flags: flag counter' field.  That'll appear only once you've added the relationship.  Make sure to select for it to use the relationship.

Let me know if this doesn't make sense and I can elaborate a little more.  :-)