Over the past two decades, a large amount of research effort has been devoted to
develo** algorithms that generate recommendations. The resulting research progress has …

Where previous reviews on content-based image retrieval emphasize what can be seen in
an image to bridge the semantic gap, this survey considers what people tag about an image …

The MovieLens datasets are widely used in education, research, and industry. They are
downloaded hundreds of thousands of times each year, reflecting their use in popular press …

Online communities are increasingly important to organizations and the general public, but
there is little theoretically based research on what makes some online communities more …

We investigate how to organize a large collection of geotagged photos, working with a
dataset of about 35 million images collected from Flickr. Our approach combines content …

In recent years we have witnessed a significant growth of social‐computing communities—
online services in which users share information in various forms. As content contributions …

Researchers and social observers have both believed that hashtags, as a new type of
organizational objects of information, play a dual role in online microblogging communities …

Social networking Web sites are not just places to maintain relationships; they can also be
valuable information sources. However, little is known about how and why people search …

This paper reviews research into social tagging and folksonomy (as reflected in about 180
sources published through December 2007). Methods of researching the contribution of …

Webometrics, the quantitative study of Web-related phenomena, emerged from the
realization that methods originally designed for bibliometric analysis of scientific journal …