I wouldn't trust the US government any more than I would trust Facebook the company(Speaking as a non US citizen). Many countries governments are less transparent than publicly traded companies. Governments often act with shady 'national security' and geopolitical interests, or sometimes even elections in mind, but at least public companies more or less motivated towards increasing shareholder value.

I do rue the dominant narrative in much of HN and the mainstream media, who is the more dangerous actor, FB vs NSA? My bet is on the NSA.