Now this should apply to every game, not just PL.
There needs to be a way for me to show my forum name in game. This will not only give everyone the ability to let everyone know who they really are. This should lead players to come to the forums and spawn more connected players in PL.
The only problem is that there would need to be a way connect the forums to in game so people cannot lie about who they are and put (for example) "samhayne".