I was reading this article from TechCrunch that CFO Gideon Yu is leaving the company because Facebook are looking for a public company experience. That to me is a non-sense alibi. Read the quote I've got from Techcrunch.

"Facebook confirms that CFO Gideon Yu will be leaving the company. Gideon has played an important role in helping us achieve our financial success, building a strong finance team and establishing the core financial operations of our company. We are grateful to Gideon for his contributions to Facebook and what we are trying to accomplish. Despite the poor economic climate, we are pleased that our financial performance is strong and we are well positioned for the next stage of our growth. We have retained Spencer Stuart to lead our search for a new CFO and will be looking for someone with public company experience." (2009, Techcrunch.com)