ds98127 - 7:58 pm on Feb 3, 2004 (gmt 0)

an addition to that is ...
1-)google looks for a seed url or a seed website ( as yet not sure) to penalize from a network which is existing in isolation and extensively crosslinks..
2-)keeping the links page changing every few day helps
3-)Immediate neighbour patterns are seen and analyzed to check repetitiveness across the network ( this has some role in chossing the seed url as well)
Random Thoughts :
This has somehow an uncanny resemblance to image processing techniques ....
take the case of opening closing operations as an analogy .. shrink and expand the network by one level(removing highest PR giver and then include it ) if there is no distortion in incoming and outgoing links it means it is heavily SEO ' ised and extensively cross linked ... not computationally extensive but memory extensive yes..keeping a PR assigned to each website ..
the shrink and expand could also account for why pages fall gradually ...
cheers
Niko