I don't think we should be too surprised with how FB will use the new data. I'm just wondering who Facebook is going to share this data with. I know a guy who works at one of Facebook's "partner companies" that pays gobs for FB user data. This partner company gets (as far as they can tell) fully-populated user data in Facebook's user dumps - way, way more information than they need or ask for. So the partner company…
But 'deleting' an account probably doesn't do much more than remove the data from the immediate web services. My data has probably been sold to multiple 3rd parties by now.