/// <summary>
/// Removes a friendship from the database
/// </summary>
/// <param name="firstUserId"></param>
/// <param name="secondUserId"></param>
/// <returns></returns>
public bool RemoveFriend(long firstUserId, long secondUserId)
{
return(firstUserId < secondUserId?_fr.RemoveFriendLink(firstUserId, secondUserId) : _fr.RemoveFriendLink(secondUserId, firstUserId));
}