Aggregator NoFollow Social Bookmarking Social Networking 
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.
Viper Chill
NOVEMBER 12, 2009
It also gets your site listed in Technorati and other blog aggregation services. Not only that, but you can easily setup email subscriptions and insert social bookmarking links directly into your feed. I also nofollow links to pages that don’t need my link juice such as About or Contact and even things like my RSS feed.
Expert insights. Personalized for you.
42 
Let's personalize your content