THANK YOU, JIM!
People need to give up on this "OMG A WEB SERVER! It's mining my identity!" thing.
If you are talking to a person, that person has every right to use his memory and recall the conversation. There is no way we can predictably force a person to forget something without making him an unperson. It is a technical impossibility.
On that same line of thinking, if your computer talks to another computer (a server), that server is completely within its right to recall that transaction. Even if it assures you that it will not, there is always a way to pry something out of there because the server is, believe it or not, processing your query, crunching numbers and sending you results... and it all happens on the server's end. Yes, it gets blasted through a couple thousand kilometres of wires, too! Oh, the horror!
In both examples, you can simply not talk to other people or not let your computer talk to other computers. (Don't pay for the Internet). However, you will notice that life gets very boring and very pointless when you walk around hidden in a mask all day.
In short, what I'm saying is that all you people moaning about privacy are already completely screwed.
Have a nice day.