You don't need to hack into sites for that—you can simply connect to a torrent and see the IPs that are uploading to you. This has been a very effective strateg

You don't need to hack into sites for that—you can simply connect to a torrent and see the IPs that are uploading to you. This has been a very effective strategy in Germany, where ISPs will happily identify their users by IP, and courts will accept these IPs as proving the identity of the uploader.