Aggregator Hubpages Reputation Social Bookmarking 
ProBlogger
OCTOBER 15, 2011
Submit your blog to social bookmarking sites like Digg and StumbleUpon. Create a hub about your blog on HubPages. Make it easy for your readers to share your posts by installing social bookmarking plugins like SocialMarker and Digg Buttons. Find a reputable list broker—or, if in doubt, why not start your own?
ProBlogger
AUGUST 15, 2012
This affected anyone who used article marketing as a way to build links and drive traffic to their websites, since article networks were hit the hardest , though some—like HubPages— regained their rankings in subsequent updates. Later, social networks like Digg, Last.fm, and others were affected as well.
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