Google have a statement on their website technical and webmaster guidelines along the lines of "don't get involved in linking schemes designed to increase your sites page rank" . Now those obcessed with PR ARE doing just that. they are link building like crazy to their home page, they are using daisy chain file linking structures, and they are using NOFOLLOW on some of their links.
So here is me with my search engineers hat on.
OK boys, today we are going to have a look at NOFOLOW abuse. pull up a site with
1. nofollow on the homepage
2. blocks of outbound link that are NOT nofollowed
3. PR value above 5.0
4. 20% above the average ratio of homepage to innerpage links
That little list there would identify a HUGE amount of link sellers, ot possible link sellers (PR Abusers).
can you see how EASY some people are making it for the spam team to identify their sites? Now keep in mind that if identified as being PR maniuplators, they will be deemed bad neighbourhoods. ANYONE linking to these sites will then also get their trust factor affected. this can lower the bar on their site, and cost them rankings.
So like google say, don't get involved with shcemes aimed at increasing your PR'. OR, if you do,
a) make sure you are clever about it and don't behave like a little sheep doing the same as everyone else.
b) make sure you can afford to lose your sites.
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