Windows Live Messenger Tops This Week's List of Fastest-Growing Facebook Apps by DAU

Windows Live Messenger leads off this week’s list of fastest-gaining Facebook games by daily active users with a healthy half-million new DAU. The messaging app is doing a great job of supplanting Facebook’s in-house chat functionality for international audiences; some 68 percent of its total monthly active userbase of 3.4 million come back on a daily basis, one of the higher retention rates we’ve seen.