If you are going to complain about network activity with bittorrent you certainly shouldn't be running it, because you don't understand the nature of it.
The whole point of bittorrent is to share your system with the world! Where do you think your downloads come from? From the web site that you would normally download from? What is the point in that? The point is to off load that server and have many servers to get parts of the needed downloads. So where do those "servers" come from? Where are you getting all those parts from? You are getting them from other users of bittorrent! And when some other person puts in a request for a download of a file that you have already downloaded your machine is going to serve up pieces of that download, from your machine to their machine.
People should really understand what they are signing up to when they use a peer to peer service like bittorrent.
Watch the video on the bittorrent web site:
http://www.bittorrent.com/