Player Dependance in Multiplayer Games
Strong multiplayer communities form when players genuinely need each other to succeed.
Schell says to create an effective online game community create situations in which players depend on each other: they require each others assistance to complete a task, or meet together at certain times to complete quests together.
References:
- The Art of Game Design - A Book of Lenses (2nd Edition) (Chapter 24. Other Players Sometimes Form Communities)