Does the 1st amendment protect my personal privacy?

[du nomad]

The 1st Amendment has nothing to do with privacy. It provides for freedom of religion, speech, the press, peaceful assembly, and to petition the government. The 4th Amendment is the closest thing to a "right to privacy," though it only protects against unreasonable search and seizure by the government. Unless you could show that the principal directly gained access to your Facebook, it wouldn't apply. It could have been one of the people on your friends list told him about it. Additionally, if you used a school computer or school network to access Facebook, then they likely would have a right to monitor that information. Also bear in mind that your Facebook profile is not your own personal private material . . . even if you set it to "private" you're posting that information on someone else's equipment/property (i.e., Facebook owns the servers & services) designed to be accessible to the general public. This means that nothing on there is truly considered "private."