Google's primary search engine will pick up some social media content, primarily blogs and public LinkedIn information, as do Bing and other search engines. (slaw.ca)
All major search engines such as Google, Bing and Yahoo have primary search results, where web pages and other content such as videos or local listings are shown and ranked based on what the search engine considers most relevant to users. (searchengineland.com)
It may not be scientific research, but Google is the Web's primary search engine and reflective of what many hundreds of millions of people are interested in. (thenextweb.com)