Analyze credit? ;-) Seriously a company as big and growing as fast as Facebook doesn't just put it's financing in the bank and dole it out as salaries - it needs to have a capital structure that manages both debt and investment over the short and long term, working capital, and generally matches types of debt to the risk of the investment.
And as companies grow bigger and faster, their need for financing becomes even greater because generally outlays precede income. Using last year's sales to finance this year's growth limits that growth unnecessarily.
And that's my regurgitation of Finance 101, which I took about a decade ago, so just a rough description.
I think it is more likely that the credit analyst determines who has to pre-pay for Facebook ads with their credit card in advance and who gets to pay via a purchase order, net 30 terms with 2% cash discount, in chunks of $100,000.
Unrelated, but what exactly does a "credit analyst" do for a company like Facebook?