\input zb-basic \input zb-ioport \iteman{io-port 05297837} \itemau{Rosenfeld, Evan} \itemti{How to build a persuasive web application. Three fundamental feedback loops.} \itemso{Oinas-Kukkonen, Harri (ed.) et al., Persuasive technology. Third international conference, PERSUASIVE 2008, Oulu, Finland, June 4--6, 2008. Proceedings. Berlin: Springer (ISBN 978-3-540-68500-5/pbk). Lecture Notes in Computer Science 5033, 241-244 (2008).} \itemab Summary: Successful web applications are able to influence the behaviors of their users. The top 40 facebook applications were analyzed to determine the most persuasive ways of achieving such influence. This paper presents a framework of feedback loops for this purpose and then applies it within the context of facebook. \itemrv{~} \itemcc{} \itemut{Persuasive technology; facebook; social networking; influence; behavior change; online communities} \itemli{doi:10.1007/978-3-540-68504-3\_22} \end