to skim traffic is to change a portion of
links on a web page so that they don't direct to a
destination originally suggested by their
caption or image. This is done, for example, to divert some of the traffic on the TGPs to associated sites.
Setting
skimming to 100, 80, 50 means first
surfer's click will go to content (100% skim ratio), second will go to content with 80%
probability, all others will go to content with 50% probability.