Examples Hubpages Social Bookmarking Wikipedia 
ProBlogger
OCTOBER 15, 2011
Let’s take article marketing as an example. Write truly informative and useful articles related to your niche, and publish them on WikiPedia. Use social networking sites like Twitter and Facebook to let people know about the contest. Submit your blog to social bookmarking sites like Digg and StumbleUpon.
Viper Chill
MARCH 4, 2010
Have you noticed how Wikipedia absolutely dominates Google search results? These are some high profile examples, but there are literally millions of useful sites online. For example, this site is “trying&# to rank for the phrase viral marketing. As an example, a site ranking 2nd for me right now is a page on Wilson Web.
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