public boolean unfollowUser(String followingUser, String id){
		String userToUnfollow= _users.get(followingUser).getUserById(id);
		User userFound= _users.get(userToUnfollow);
		if ((userFound != null) && (userFound.checkIfCanRemoveFollowingUser(followingUser, id))){
			return ((_users.get(followingUser).unfollowUser(userToUnfollow, id)) && (userFound.removeFollowingUser(followingUser, id)));
		}
		return false;
	}