Web 2.0 refers to the second generation of the World Wide Web, characterized by user-generated content, interactivity, and collaboration. Social networking sites like Facebook and MySpace allow users to connect and interact with others, sharing information and media. Video sharing sites like YouTube enable users to upload and share videos with a wide audience. Blogs are online platforms where individuals can publish their thoughts, opinions, and experiences. Therefore, all the options listed in the question (social networking sites, video sharing sites, and blogs) are examples of Web 2.0.