9. The method according to claim 1 , wherein the filtering further comprises monitoring a depth for each said link, the depth being a reflection of relevance to said predefined particular subject.
10. The method according to claim 9 , wherein said monitoring comprises: for a given said object being visited resulting from said link, setting a said depth of any links leading from said object to other objects to a depth of a link traversed to reach the given object; wherein said given object is determined to be relevant to said predefined particular subject, setting the depths of the links leading from said object to zero; and wherein said given object is determined not to be relevant to said predefined particular subject, incrementing the depths of the links leading from said object.