A colleague who has a startup in the US for social networking for doctors was whining to me the other day that advertising business models are dead for everyone except the top 5-10 Internet properties like Yahoo and Google. He said that Google does a great job of aggregating ads from small Web site but that doesn’t mean that a small-mid size Web property can monetize traffic enough in order to be profitable. It’s a corollary of the long tail of the Internet, that the small guys a the end of the tail will never have enough traffic to monetize.
A common vulnerability in online ecommerce sites is fraudulent manipulation of user profiles in order to boost the ratings of products in online recommender systems and overall reputation of the web site.
This article – Unsupervised Retrieval of Attack Profiles in Collaborative Recommender Systems casts this problem as a problem of detecting anomalous structure in network analysis and proposes a novel mechanism for detecting this anomalous structure.