1. Introduction Put out a few topics for discussion: –Scope of weblog spam –Incentives to spam –Personalization and spam

2. Most blogs have no regular readers Bloglines was the dominant feed reader with 33% market share in January 2005 according to Dick Costolo, Feedburner, http://blogs.feedburner.com/feedburner/archives/000961.html Total weblogs from Dave Sifry, Technorati, http://www.technorati.com/weblog/2005/10/53.html Bloglines subscription metrics from Jim Lanzone, Ask.com, http://blog.ask.com/2005/10/deep_thoughts_a.html

3. Scale attracts spam Web started without spam As audience grew, profit motive grew Weblogs started without spam As audience grew, profit motive grew Hitting the mainstream attracts spam

4. “Winner takes all” attracts spam Getting the top slot: Jackpot! –Everyone will see it Personalization as a solution? –Each person sees different content –Targets differing perceptions of relevance

5. Findory.com Recommender system: News and weblogs –Learns from clickstream Every reader sees a different page –Reduces “winner takes all” Crawl focuses on weblogs with readers –Reduces spam blogs

6. Greg Linden Findory.com Amazon.com, Personalization University of Washington CS in AI Stanford Business School