Squawk7700 - everyone has stuff they assume is hidden. They might be 100% legal but everyone has stuff they'd rather wasn't public knowledge.
Would you be happy that your FOI knows that you rang a doctor specialising in STDs? (Happens to be a social acquaintance.) Or that your wife visited the Beyond Blue website? (Perhaps has a friend who is not so flash.) Etc etc
All perfectly legal and maybe even honourable - but you wouldn't want stuff like that to be public - it's called privacy.