It's stock market stuff. If there is no new EU-US privacy deal, that's likely going to cause some kind issues for Facebook. If that happens, some investor can s

It's stock market stuff. If there is no new EU-US privacy deal, that's likely going to cause some kind issues for Facebook. If that happens, some investor can sue Facebook for "you didn't tell us there was a risk you'd have problems in Europe!". Thus, Facebook does what any company is supposed to do: put the potential risks to their business in their SEC filings, so investors can read that, be happy and not pretend they were defrauded because they weren't told obvious things.