Web 2.0 refers to second-generation internet services that allow for more dynamic interactions and sharing between users through social networks, blogs, podcasts and other media. Popular social networks like Facebook, Flickr and MySpace allow people to connect in online communities to share interests, activities and communicate with friends. Podcasts have grown rapidly, with over 56 million users expected by 2010, and allow people to access digital audio and video files on various topics through RSS feeds on any device. They cover a wide range of subjects from news to religion to hobbies. Podcasting has been adopted by many industries like radio, universities and companies to share information.