↑ Irrelevant keywords, Google Keyword Quality Guidelines ↑ The Panda That Hates Farms: A Q&A With Google’s Top Search Engineers, Wired.com, March 3, 2011 ↑ All About the New Google "Hummingbird" Update, SearchEngineLand.com.com, September 26, 2013 ↑ Bing URL Stuffing Spam Filtering, Bing.com Blogs, September 10, 2014 ↑ On Language, The Web Is At War With Itself, Linton Weeks, for National Public Radio, July 15, 2010.