I feel like this is a very naive way to look at this. As kpcyrd said, you're simply adding to their data, not 'corrupting' anything you've previously shared. If anything, you're sending up a big red flag from suddenly changing your gender, location, etc all at once.
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FB does allow you to edit >:)
I doubt this is actually overwriting anything, it just adds more data to facebook's database.
That's fine. It just means I've become a bi-coastal, transgendered, red headed, left handed bag pipe player with a speech impediment.
Regardless, the data is corrupt at that point, and that, is the point.
I feel like this is a very naive way to look at this. As kpcyrd said, you're simply adding to their data, not 'corrupting' anything you've previously shared. If anything, you're sending up a big red flag from suddenly changing your gender, location, etc all at once.
It may not hide anything from FB, but it will hide from anyone using FB to observe you, which seems like what the OP wants.