Not so long ago, I set up my own torrent tracker: https://pybittrack.retiolus.net

After all this time I wondered what was being shared through my tracker, and for the last 3 days I've been storing the hashes of the torrents announced through the tracker, there are around 4,500,000 different hashes. With these, I've been able to find the 100 most downloaded torrents, 93 out of 100 of which are porn.

I have to admit, I'm a bit disappointed.