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ACM Transactions on the Web (TWEB), Volume 1 Issue 2, August 2007

Visualizing tags over time
Micah Dubinko, Ravi Kumar, Joseph Magnani, Jasmine Novak, Prabhakar Raghavan, Andrew Tomkins
Article No.: 7
DOI: 10.1145/1255438.1255439

We consider the problem of visualizing the evolution of tags within the Flickr (flickr.com) online image sharing community. Any user of the Flickr service may append a tag to any photo in the system. Over the past year, users have on average added...

Scouts, promoters, and connectors: The roles of ratings in nearest-neighbor collaborative filtering
Bharath Kumar Mohan, Benjamin J. Keller, Naren Ramakrishnan
Article No.: 8
DOI: 10.1145/1255438.1255440

Recommender systems aggregate individual user ratings into predictions of products or services that might interest visitors. The quality of this aggregation process crucially affects the user experience and hence the effectiveness of recommenders...

The effects of proxy bidding and minimum bid increments within eBay auctions
Alex Rogers, Esther David, Nicholas R. Jennings, Jeremy Schiff
Article No.: 9
DOI: 10.1145/1255438.1255441

We present a mathematical model of the eBay auction protocol and perform a detailed analysis of the effects that the eBay proxy bidding system and the minimum bid increment have on the auction properties. We first consider the revenue of the...

Decoding the structure of the WWW: A comparative analysis of Web crawls
M. Ángeles Serrano, Ana Maguitman, Marián Boguñá, Santo Fortunato, Alessandro Vespignani
Article No.: 10
DOI: 10.1145/1255438.1255442

The understanding of the immense and intricate topological structure of the World Wide Web (WWW) is a major scientific and technological challenge. This has been recently tackled by characterizing the properties of its representative graphs, in...