Community systems research at Yahoo!Community systems research at Yahoo! Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-11-302007enThe web and its continued evolution present unprecedented opportunities for database researchers and practitioners to deliver unique user experiences that are not possible traditionally, e.g., mass collaborations through (automatically) established online communities and exploration of large scale structured information. Along with these opportunities, however, come significant challenges. The challenges are twofold: systems, the infrastructures that allow us to deliver information at scale; and community, the applications that deliver the next generation of web experiences centered around people and social networks. In this paper, we describe the ongoing research efforts within the Community Systems group here at Yahoo! Research to address these challenges.http://creativecommons.org/licenses/by/4.0/ACM SIGMOD Record 36347-54 Garofalakis Minos Γαροφαλακης Μινως Yahoo! Research Community Systems Group Association for Computing Machinery Information storage and retrieval Systems and software