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I didn't hide them, I clicked "Remove Post", "Remove Comment" etc. for each. Of course, Facebook probably archives them somewhere anyway.

I did the same thing. Delete everything. Although, some actions you can only "hide", like comments on other people's walls and such. At least that's my understanding.

For what it's worth, I routinely delete status updates and have never had one come back in a redesign. Other activity might not be as fortunate.

Same experience, i think they delete nothing at all.