It still massively affects you (assuming you are in the US), because of the 4th Amendment. That's the one that prohibits unreasonable search and seizure.
A key factor in whether a search or seizure is unreasonable is whether or not you have a reasonable expectation of privacy. The standard for what is a reasonable expectation of privacy is what society considers to be reasonable, not what you individually consider to be reasonable.
So even though you are not on Facebook, all those people who ARE on it and are sharing publicly the most intimate details of their lives are moving the 4th Amendment boundary between searches and seizures that require a warrant and those that do not.
A key factor in whether a search or seizure is unreasonable is whether or not you have a reasonable expectation of privacy. The standard for what is a reasonable expectation of privacy is what society considers to be reasonable, not what you individually consider to be reasonable.
So even though you are not on Facebook, all those people who ARE on it and are sharing publicly the most intimate details of their lives are moving the 4th Amendment boundary between searches and seizures that require a warrant and those that do not.