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User contribution systems aggregate and leverage various types of user input in ways that are valuable to others.  The table below lists the two main flavors of UCS: Active systems where users know they are contributing (even if they might not call it that) and Passive systems, where the contribution is implicit.  Within each flavor, you will see what is aggregated by the system, e.g. content or goods/services.  Finally, there is a more detailed breakdown of the specific kinds of contributions, e.g. opinions or computing resources. 

User Contribution Systems
Active		Passive
Aggregates Content	Aggregates Goods & Services	Aggregates Behavioral data	Aggregates Resources
Creative expression & entertainment	Advertising	Attention data	Computing capacity
Youtube, PMOG, flickr, Spore, American Idol more >>	Google Adwords, Craigslist,	Last.fm, Newsgator's RSS readers	SETI@home, Skype, World Community Grid
Employee support	Customer Service	Buying behavior	Computer sensing capabilities
BlueShirt Nation at BestBuy	AT&T, Yatt'it	Amazon product recommendations, Netflix, iTunes Genius	Honda's InterNavi, Dash
Expertise	Design and Development	Company behavior
Wikipedia, Sermo, AT&T support forums more>	Threadless, Flip Video	Westlaw's PeerMonitor law firm database
Opinions & ratings	Goods	Web-linking behavior
Zagat guides, TrustedOnes more>>	eBay, DonorsChoose, Prosper, Trulia	Google's search engine algorithm
Social connections & personal information	Marketing
Facebook, MySpace, LinkedIn, FriendFeed, Glassdoor more>>	Being Girl
Software code
Firefox, Linux, OpenOffice.org, GIMP

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