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Facebook may be the hottest development platform on the Web, but it has yet to answer a very important question: How are companies making money off Food Fight and SuperPoke? After it was revealed that the "Where I've Been" app wasn't sold for $3 million, one has to wonder if these developers are gaining anything more than exposure. Well, a tipster claims that one Facebook app, Free Daily $5,000 Poker Tourney, is making money. Naturally. PurePlay's poker application requires users to download a proprietary poker client, which serves advertisements to anyone who wants to partake in its free, cash-prize tournaments. And it makes some cash off people who pay to remove ads and receive a crappy newsletter. There's a lesson for all you Facebook developers — make "applications" that are just giant advertisements for your company's real moneymaker.