Web-based advertising revenue in India has touched Rs 2,500 crore said Google India managing director Rajan Anandan. He was speaking at Indian School of Business Digital Summit 2012. He said that efforts are made to widen the reach of web-based services. In India currently, there are 50,000 web publishers. In the future the number would increase by manifold. With advancement of technology, we are facing new challenges, he added. Research is going on to overcome new issues, he said.