Sony has $151 billion in assets, that's more than Microsoft and Google. Facebook isn't even close to any of those three and damn sure can't buy it. I swear, dudes underestimate how big of a company Sony really is (which is part of their ongoing financial problems, but that's another story)
Word how much do they have in liabilities then? Sony isn't worth anywhere near 151 Billion. Not sure where you got that from.
http://www.forbes.com/companies/sony/
http://www.forbes.com/companies/facebook/