The Nobel prize being awarded to Thomas Schelling and Robert Aumann.
According to BBC online:
Professor Aumann’s work has centred on a different element of game theory, the question of whether co-operation increases if games are continually repeated.
He showed that co-operation is less likely when there are many participants, when interactions are infrequent, when the time horizon is short or when others’ actions cannot be clearly observed.
Does say a thing or two about online games, no?