Web 2.0 technologies encourage new means of sharing information, cooperation and communication among people. By applying Web 2.0 technologies in libraries the whole scenario of libraries has changed, they provide information accessible to the users whenever they want, and to ensure that all the obstacles in getting information are removed. Web 2.0 is a variety of technologies which present a different stage of interaction among the users and played an important role in to keep update with changing requirements of library patrons.