This paper describes an extensive online project, Writingmatrix [http://writingmatrix.wikispaces.com], involving several key elements essential to collaboration in Web 2.0, such as aggregation, tagging, and social networking. Participant teachers in several different countries--Argentina, Venezuela, and Slovenia--had their adult students at various levels of English competency interact using blogs and other Web tools, including RSS feed readers and Technorati [http://technorati.com]. The teachers describe their respective settings, how they got their students started in communicating through blogging and social networking, and how in future they intend to expand the Writingmatrix experience. (Contains 3 figures.)