anyone can use the aarf tag and associate it with a bookmark. This potentially lets us get information from a larger audience. Which may turn out to be a bigger spam issue more than anything else. The only information that can be gleaned from this is what
APML allows users to share their own personal Attention Profile in much the same way that OPML allows the exchange of reading lists between News Readers.
D. Millen, J. Feinberg, and B. Kerr. CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 111--120. New York, NY, USA, ACM Press, (2006)