If companies are acting in their own interest, then there's no reason for them to do this unless it's a law. I believe there is legislation being drafted regard

If companies are acting in their own interest, then there's no reason for them to do this unless it's a law. I believe there is legislation being drafted regarding how people's information can be handled on social networks. How would it help though? Sites are still caching old versions of pages. You can annotate that you don't want to share it anymore, but a copy still exists and can be found.