Edit all of your info to be completely bogus, so make sure before deactivating to edit your account to accurately represent your position as the CEO of the Pacific Ocean, and your legal name change to Fried Onion.

Or if you wanna make it have an adverse an effect on them, put in some time to make it look realistic enough but still fake so that they keep the data instead of trashing (possibly reverting, if they have a backup?) it if it ever comes up.