A tag cloud (a typical Web 2.0 phenomenon in itself) presenting Web 2.0 themes Web 2.0 (also known as participative (or participatory)[1] web and social web)[2] refers to websites that emphasize user-generated content, ease of use, participatory culture and interoperability (i.e., compatibility with other products, systems, and devices) for end users. The term was coined by Darcy DiNucci in 1999[3