The P3P solution has great advantages for recommenders. It provides a persistent identifier that the site can use to maintain data
about a consumer while protecting the consumer by limiting the connection between the real-world identity and the site identifier.
P3P also makes it easy for consumers to have multiple identities to represent their multiple different shopping modalities. For
instance, a parent might choose to have a different identity while shopping for himself then when shopping for his children. This use
of identity to indicate role would simplify the job of recommenders since they would not have to separately try to analyze role. If P3P
is supported by the Web clients and embraced by consumers, it may open great opportunity for recommenders.