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A number of researches have been focused on improving the productivity of knowledge workers. Effective communication is determinative, and one important problem has been to find the right person for collaboration. The Semantic Web efforts improve it by better wide-range knowledge management. Through extending the FoaF (Friend of a Friend) vocabulary, knowledge workers can share their machine-readable knowledge world widely, so that their PCs can facilitate effective collaboration efficiently. This paper presents an approach to support networked personal knowledge management. An example of extended FoaF is also described