Graphity: An Efficient Graph Model for Retrieving the Top-k News Feeds for Usershttp://www.rene-pickhardt.de/graphity-an-efficient-graph-model-for-retrieving-the-top-k-news-feeds-for-users-in-social-networks/ by jrullmann • 11 years ago 2 0 11 years agoRErene-pickhardt.de