Blogs: Blogs, short for web logs, are like online journals for a particular person and are powerful tools. The owner posts a message periodically, allowing others to comment. Some blogs allow comments on the entries, thereby creating a discussion forum. Blogs may even have blogrolls which are links to other blogs. Pingback and trackback allow one blog to notify another blog, creating an inter-blog conversation. Blogs engage readers and can build a virtual community around a particular person or interest. Examples include Slashdot, LiveJournal, BlogSpot, and Wordpress. An offshoot of blogs are Vlogs which are video blogs. The most popular example of this is YouTube.
Collaborative real-time editor: Simultaneous editing of a text or media file by different people on a network can be traced back to the 1970s but is now a practical application. Examples are SubEthaEdit, SynchroEdit, Moonedit are examples of this type of social software. Google Docs & Spreadsheets and Zoho allow for joint editing, but other users will only see changes after saving.
Ning: an online platform for users to create their own social websites and social networks
Semantic Web: an evolving extension of the Internet in which web content can be expressed not only in natural language, but also in a format making it easier to find, share and integrate information.
Social Bookmarking: Commonly used in blogs, site authors attach keyword descriptions (called tags) to identify images or text within their site as a categories or topic. Web pages and blogs with identical tags can then be linked together allowing users to search for similar or related content. If the tags are made public, online pages that act as a Web-based bookmark service are able to index them. Tags can be created using words, acronyms or numbers.
Social Networking- Most social network services are primarily web based and
provide a collection of various ways for users to interact, such as chat, messaging, email, video, voice chat, filesharing, blogging, discussion groups, and so on. A social networking site is the phrase used to describe any Web site that enables users to create public profiles within that Web site and form relationships with other users of the same Web site who access their profile. Social networking sites can be used to describe community-based Web sites, online discussions forums, chatrooms and other social spaces online.
Social Software: Normally applied to a range of web-enabled software programs. The programs usually allow users to interact and share data with other users.
Virtual worlds: These are services where it is possible to meet and interact with other people in a virtual environment. Users move through the world by manipulating their custom-made avatar. A very popular example is Second Life.
Web mapping is the process of designing, implementing, generating and delivering maps on the Web.
Wikis: a webpage that can be edited by its visitors. Examples include Wikipedia, Wiktionary, Portland Pattern Repository, MeatballWiki, CommunityWiki, and Wikisource and the niche Congresspedia, dedicated to information regarding Congress