I agree with this sentiment exactly. I have a facebook profile that I started literally the week that it was available in my*university over 8 years ago (when there were only a couple thousand users in its infancy and you had to be a student at a small list of colleges), and I have been very careful to ensure incriminating pictures and posts are nowhere near my page the whole time. I am friends with relatives and a couple of coworkers, so I am very congizant of the audience I have looking at all the information that gets posted and I've never had an objection.
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HOWEVER, I do have private messages that exist in no other medium that I would not want to share with anyone because they are just that - private. For example, if someone had found me on facebook that I hadn't seen since middle school and wrote about a prank we pulled or a crush we had, I wouldn't want anyone else perusing the conversation. Regardless of the nature of those messages, they should be completely protected, and I think it is WAY overstepping the bounds of a company, government agency or girlfriend *to ask for full access to your facebook. I would however not mind adding a potential as a friend on facebook to let them see what my profile is like - in fact, I'd gladly do that. I'm pround of a lot of the stuff on there because they'd see that I volunteer, I'm active in lots of sports and recreation, I'm close with my friends and family, and I am a dynamic person not just a numbers guy (I work in corporate finance). So I think them seeing a different side of a person rather than some young guy in a grey suit and white shirt would be a very positive revelation, but I don't think anyone should be allowed to sift through the personal side of someone else's page.

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