Web 2.0 is the second generation of web development and design. Web 2.0 is a concept of the development of web communities, hosted services, video and music sharing websites, blogs, social networks, etc. Social networks and blogs such as Facebook and Twitter, allow people to generate and control content, in which they form communities. These Social network websites are very similar and rely on the ability of people to easily generate and retrieve their content and to present it in an appealing way. You can also make different interfaces using data from the above web communities such as Mash ups. Mash ups are a way to change various concepts of web 2.0 into hybrid forms. It involves exploiting the API by using the same data and presenting it in a different way.