Why is there no discussion of obligations? A company could have a lot of cash and real estate, but debt obligations could wipe out a ton of that value. I realiz

Why is there no discussion of obligations? A company could have a lot of cash and real estate, but debt obligations could wipe out a ton of that value. I realize the discussion is about Zynga's deteriorating future but it seems that in order to draw any conclusioons from the stock price being lower than cash+real-estate a discussion of obligations is required.