The Web is about you and me.  Until now, for the most part, it has denoted a corpus of information that we put online sometime in the past, and the most celebrated Web application is keyword search over this corpus. Sites such as del.icio.us, flickr, MySpace, Slashdot, Wikipedia, Yahoo! Answers, and YouTube, which are driven by user-generated content, are forcing us to rethink the Web — it is no longer just a static repository of content; it is a medium that connects us to each other. What are the ramifications of this fundamental shift? What are the new challenges in supporting and amplifying this shift? From the Series:CSE Colloquia - 2007