Introduction and Support
Google announced in early 2005 that hyperlinks with rel="nofollow" would not influence the link target's PageRank. In addition, the Yahoo and Bing search engines also respect this attribute value.
On June 15, 2009, Matt Cutts, a well-known software engineer of Google, announced on his blog that GoogleBot will no longer treat nofollowed links in the same way, in order to prevent webmasters from using nofollow for PageRank sculpting. As a result of this change the usage of nofollow leads to evaporation of pagerank. In order to avoid the above, SEOs developed alternative techniques that replace nofollowed tags with obfuscated JavaScript code and thus permit PageRank sculpting. Additionally several techniques have been suggested that include the usage of iframes, Flash and JavaScript.
Read more about this topic: Nofollow
Famous quotes containing the words introduction and/or support:
“Do you suppose I could buy back my introduction to you?”
—S.J. Perelman, U.S. screenwriter, Arthur Sheekman, Will Johnstone, and Norman Z. McLeod. Groucho Marx, Monkey Business, a wisecrack made to his fellow stowaway Chico Marx (1931)
“Many people now believe that if fathers are more involved in raising children than they were, children and sons in particular will learn that men can be warm and supportive of others as well as be high achievers. Thus, fathers’ involvement may be beneficial not because it will help support traditional male roles, but because it will help break them down.”
—Joseph H. Pleck (20th century)