Abstract: This paper proposes a novel collaborative filtering method for link spams on Blogs. The key idea is to rely manual identification of spams and share this information about spams through a network of trust. The bolggers who has identified a spam tells a small number of fellow bloggers(content implantation), and those who have not heard about it start a search using a percolation search, combined with content implantation, they confirm the information about identified spam.

Key words: percolation search, collaborative, Bolg spam