cmonurz What does a typical 'expose' involve?
Four pages in the News of the World that make derogatory claims about the alleged 'wrong-doer'. I'd try to stop such a story getting published about me*, especially if it were false. A story in the papers can damage someone's reputation beyond anything that can be repaired by sueing anyone. The stories are not presented in any way sympathetically towards the footballer/movie star/whoever.
In my opinion, reputations are repaired by successful libel actions so I guess we'll have to agree to disagree. Personally I wouldn't want to stop a story getting published about me. If it's untrue, what have I to worry about? Could even be a bit of a cash cow. If it is true, then it's my fault and I'll face up to the consequences.