According to Torrent Freak, “…YouHaveDownloaded is a new Russian-based service that claims to track about 20 percent of all public BitTorrent downloads. They go a step further than just collecting IP-addresses and file-names by exposing all the harvested information to the public on their website.
People who visit the site immediately see their download history, as far as it’s available in the site’s database. In addition, they can also search for files or IP-addresses to find out who’s downloading what. At the time of writing the database has information on 51,274,000 users who together shared 103,200 torrents.
For full article, see Torrent Freak.