Blog: Web log or chronological online personal journal with reflections, comments and often links to other Web sites produced by the writer. Others may subscribe to a person’s blog, which allows them to read it and write comments in response.
Podcast: A syndicated audio (or video) program produced either by traditional media, such as radio and television, or by individuals, including educators, hobbyists, students, or other enthusiasts passionate about a topic.
Image Editing: The ability to manipulate, enhance, and transform images. Simple edits include cropping and removing red-eye; more complicated techniques are working with light, contrast, layers, and making substantial alterations. Social bookmarking: A Web-based service where shared lists of user-created Internet bookmarks are displayed. These bookmarking sites are a popular way to locate, classify, rank, and share Internet resources.
Social networking: A social network focuses on building online communities of people who share interests and activities, or who are interested in exploring the interests and activities of others. Most social network services are web-based and provide a variety of ways for users to interact, such as e-mail and instant messaging services. Social networking has created powerful new ways to communicate and share information.
Vlog: (short for video blog): A term used to describe a blog that includes or consists of video clips. Typically updated daily (or with regular frequency), vlogs often reflect the personality or cause of the author.Wiki: A type of Web site that allows visitors to easily add, remove, or otherwise edit and change some
Definitions adapted from Wikipedia