This thesis did not directly address the issue of what information will be most useful for collaborative filtering. As will be discussed in the last chapter, it is unclear whether numerical rankings from users provide enough information to help other users filter articles. It is also likely that there is other information we could gather inoffensively which would be cheap to transport and useful for filtering. The goal of the vote transport system we created was to be flexible enough to encompass extra information as an add on. Once some system is operational, it will be possible to experiment with exchanging different types of information.