Google has been plagued by black market business practices and content farms for a while . Content farms are low quality sites that attract traffic with ( mostly ) useless content . The change would affect 11.8 percent of Google 's revenue .
Google has been plagued by black hat SEO practices and content farms for a while . Content farms are low quality sites that attract traffic with ( mostly ) useless content . The change should impact 11.8 percent of Google 's queries .