IanTurner - 5:06 pm on Apr 12, 2012 (gmt 0)
My few words on Zombie traffic - if Google sees bounce rate as a quality signal for a site - a simple negative SEO tactic would be to worsen your competitors bounce rate by throwing them zombie traffic.
If Google is also doing traffic shaping then another good negative SEO tactic would be to send them zombie traffic at the high conversion times during the day.
@netmeg it is relatively simple to create a bot that looks like a regular visitor and that sends referrers - you can also create a bot that will follow links on a page.
In order to employ the negative SEO tactics outlined above - of course you would need a bot net and delivery method to the zombie PCs so that would make those tactics the prerogative of sophisticated hackers.