I do not find any online information posted by ordinary citizens private with the exception of email. I think this because I view this as a private conversation. My opinion, however, changes when discussing email viewing of suspected terrorists. I am in full support of the government doing this because this involves our national security. I believe that this should only be done if the person is suspected as being a terrorist, not any ordinary citizen.
Because information such as that on social media websites is open to the public to see, I have no problem with the government reviewing this information. Any information that is able to be viewed by others on the internet should be allowed to be reviewed by the government. My view is, if someone does not want their information reviewed, do not post it! As previously said, emails are the only exception in my mind.