Half a billion users can't be wrong. Right?
Half a billion connected users is certainly a captive audience.
What then, would Facebook be if it wasn't Facebook? With the currencies of 700 billion minutes a month and the emotional investment of all those users, here are some other companies whose business model Facebook could easily adopt, overtake, or buy:
Once Facebook Convergence is complete, what killer apps outside of Facebook will be left?
Think about your current social media campaigns, today. Think about how they might change if even one of the above suggestions occurs...