The words “for public use” are actually in the 5th Amendment, and were included as a clear and hard limit on governments’ powers of imminent domain. Yet five supreme court justices ignored those words.
I don't think the word “privacy” is even in the Constitution at all. Further, I do not think “privacy” can be an issue when discussing things that a person willingly posts to a web-site or web-sites which can, will and are intended to be, viewed by millions of people.
I think that many people here on this site value their privacy
If FReepers value their privacy and do not like government sticking their big nose in their business please send me a private message.
http://www.usconstitution.net/constnot.html#privacy
Things not in the Constitution
The Right To Privacy
The Constitution does not specifically mention a right to privacy.
However, Supreme Court decisions over the years have established that the right to privacy is a basic human right, and as such is protected by virtue of the 9th Amendment. The right to privacy has come to the public’s attention via several controversial Supreme Court rulings, including several dealing with contraception (the Griswold and Eisenstadt cases), interracial marriage (the Loving case), and abortion (the well-known Roe v Wade case). In addition, it is said that a right to privacy is inherent in many of the amendments in the Bill of Rights, such as the 3rd, the 4th’s search and seizure limits, and the 5th’s self-incrimination limit.