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.
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. 11. The method according to claim 10 , wherein said monitoring further comprises: comparing the incremented depths to a predetermined maximum depth value; wherein when the incremented depths exceed the predetermined maximum depth value, discarding the links leading from said given object; wherein when the incremented depths do not exceed the predetermined maximum depth value, traversing one of the links leading from said given object.