Niall Kennedy has one of the most thorough write-ups on why search spam exists with his article "The Spam Farms of the Social Web." The article explains how he stumbled upon a spam site, researched the site to death, guesstimates on how much money they can make and services that help you make it rank well. This includes a look at blogs, digg, del.icio.us, other social sites, link building tactics, directory inclusion, content writing, and more.
Optimising Digital Marketing Campaigns with Search, Social and Analytics
At SES London (9-11 Feb) you'll get an overview of the latest tools, tips, and tactics in Paid, Owned, Earned, Integrated Media and Business Intelligence to streamline your marketing campaigns in 2015. Register by 31 October to take advantage of Early Bird Rates.