Nofollow links seem to be a common area of discussion around SEO, and specifically the subject of several videos from the Google Webmaster YouTube Help channel. After a number of repetitive questions, Matt Cutts decided to try to make Google’s position on nofollow tags a bit clearer in this video.
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The search engine market is quite a crowded place. Google, by far the dominant search leader, has a massive 65% market share. Yahoo comes in at a distant second, so far back that they had to make a deal with 3rd place Bing in order to share results and ads , making them big enough to compete.

