The past year has seen a dramatic increase in the amount of social information published in RDF documents. Our investigations [1, 2] show that the Friend of a Friend (FOAF) on- tology [3] is among the most used semantic web ontologies. This is true if we measure the number of semantic web documents (SWDs) that use the FOAF namespace, as Table I shows, or the number of triples using FOAF terms. …