However, while a lot of BitTorrent sites log how much you upload and download (for reasons of ratio and to weed out leechers) most don't log what files you uploaded and downloaded. Last December the MPAA launched an aggressive campaign against individual file sharers and some services like BitTorrent hubs. Since then, many sites have closed their doors either voluntarily or because of legal action taken against them.
BitTorrent is legal and is increasingly being used for legitimate distribution. Bram Cohen, creator of BitTorrent has long warned that using BitTorrent to share copyrighted material is a "dumb idea" because it's not designed to hide the identities of people sharing. Operators of BitTorrent sites argue that they do not host any copyrighted files at all, they just host .torrent files which are then used by file sharers to start downloading and sharing with each other.
Source:
ZDNet