Is Facebook becoming a good old fashioned conglomerate? Felix Salmon thinks so:
Zuckerberg knows how short-lived products can be, on the internet: he knows that if he wants to build a company which will last decades, it's going to have to outlast Facebook as we currently conceive it. The trick is to use Facebook's current awesome profitability and size to acquire a portfolio of companies; as one becomes passé, the next will take over. Probably none of them will ever be as big and dominant as Facebook is today, but that's OK: together, they can be huge.
Facebook is no longer a one trick pony company. That's a survival strategy.