Email CC: -- basic, first generation Web 1.0 application
Instant messaging -- one-to-one; communicate with another person over a network; AOL Instant Messenger; Yahoo! Messenger, SMS
Internet Relay Chat -- one-to-many/many-to-many; virtual meeting rooms; chat rooms
Internet Forums -- one-to-many/many-to-many; bulletin boards, discussion board; news groups, listservs, Yahoo! Groups
Blogs or Weblogs -- one-to-many/many-to-many; online journals, trackback; Blogger, EduBlogs, Elgg
Wikis -- one-to-many/many-to-many; online database; quick; open editing; Wikipedia, PSU Wiki Portal
Social Network Services -- one-to-many/many-to-many; allow people to come together online around shared interests or causes; Friendster, Classmates, Orkut
Social Guides -- one-to-many/many-to-many; recommending places to visit in the real world such as coffee shops, restaurants, and wifi hotspots; one-to-many; Cafe Spot, Tagzania
Social Bookmarking -- one-to-many; Some web sites allow users to post their list of favorite websites for others to search and view. This alloows people to meet or link to others with whom they share a common interest; del.icio.us, furl, blinklist, Tagcloud
Social Citations -- one-to-many; post a citation for an article found on the internet; CiteULike
Social Libraries -- one-to-many/many-to-many; allows visitors to keep track of their collectibles; users can share their collections and recommendations are generated based on the ratings; Discogs, Bibliophil
Social Shopping Applications -- one-to-many/many-to-many; users provide product recommendations and reviews; Swagroll, Stylefeeder
Peer-to-Peer Social Networks -- one-to-many/many-to-many; allow users to share blogs, files (e.g., music, photographs) and instant messages; Imeem, Qnext
Collaborative Real-Time Editing -- one-with-many; collaborative editing of a text or media file by different users on a network; SubEthaEdit, Writely
Virtual Worlds and Massively-Multiplayer Online Games -- one-to-many; many-to-many; places where it is possible to meet and interact with other people in a world that looks somewhat like reality; Second Life, Active Worlds, World of Warcraft
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