Reasonly users of social networks of internet have been developing. This application development of this web is not only used for making a friend, but also for bussiness, entertainment and politics. This social networks can be categorized into technology of web 2.0. Accountability is an action that assures that governments meet their promises to public. This paper is intended to explain the opportunities of using the technology of Web 2.0 as tool for public in demanding government accountability.