Facebook on Tuesday simultaneously sacked its CFO, released financial data for 2008 and 2009, and hinted that an IPO was forthcoming. VentureBeat's Eric Eldon says this is Facebook's way of defending itself to the press, which has been critical of the social networking giant's ability to make money from advertising, its apparent struggle to raise more capital, and its recent string of high-profile employee defections. The company revealed that it's on track to make 70% more this year than in 2008. Eldon notes that if 2008 revenues were close to $300 million, then this year's revenue must be close to …