Showing Avatars for non-friends

When a new user creates an account on our site and adds for example, User A as a friend. Then goes to the Activity Stream they are able to see all of User A’s posts.

Under the posts it shows the avatars for the people who have liked the post. Even though the new user isn’t friends with the users that liked the post, their avatars still show up.

Is there a way to prevent this from happening? For security and privacy reasons I would like only the avatars to appear if you are friends with that person.

Hope you’re doing well.