Web 2.0 refers to interactive websites that allow users to share and interact with each other by sharing information, adding comments, chatting, collaborating on content, and creating their own content. Blogs allow users to easily publish their views and opinions without oversight. Wikis are websites that allow users to collaboratively create and edit pages of information. Popular media uploading sites like YouTube and Flickr enable users to share photos, videos, and music while following copyright rules. Social networks like Facebook enable users to connect with friends and family and share information.