/// <summary>
/// Returns true if the selected users are friends, false otherwise
/// </summary>
/// <param name="firstUserId"></param>
/// <param name="secondUserId"></param>
/// <returns></returns>
public bool AreFriends(long firstUserId, long secondUserId)
{
return(firstUserId < secondUserId?_fr.AreFriends(firstUserId, secondUserId) : _fr.AreFriends(secondUserId, firstUserId));
}