Not really.

There is no ‘right to privacy.’ People often confuse the right to be free from unreasonable search and seizure (4th amendment) with some imagined right to privacy. ‘Expectation of privacy’ is an entirely different concept, and doesn’t rise to the level of being a right.

There are many ways around FB’s privacy settings. Law enforcement can easily get around them with a warrant, but there are many other ways. Anyone of your FB ‘friends’ can copy and repost anything, for example.

Another little-known gem is that clicking ‘I Agree’ when you install a game or an app resets all kinds of privacy settings, and all you info is now up for sale to any 3rd party willing to cough up a buck or two.