Well yes, I imagine that hosting the torrent file itself would not be a problem. Perhaps I was confused by "seed" in your subject line. I believe that in common bt terminology, seeding implies actually running (client) bittorrent software.
If you are just talking about hosting the torrent file, I imagine you would tell the world that the file is there the same way you would for any other web content. To my knowledge there is no "master list" of torrent files anywhere, though there are some BT-specific search engines.