In line with the slew of new words and terms created by social media, so have a tremendous amount of websites cropped up dedicated to the whole concept. Listing all the social media sites can be a daunting task as there are literally hundreds in existence and, for the purposes of this guide, it would be impractical to include all of them.

With that, the following is a brief list of some of the more popular sites used by and for businesses, their staffs and owners. More detailed stories on how to use the more popular sites with regard to business are showcased in the rest of the Guide.

Delicious (del.icio.us): A social bookmarking site that allows people to store and add bookmarks so they can access them from any computer, anywhere. Users can also store, organize and share favorite web pages, and subscribe to RSS feeds of other users. Last year it claimed more than 5.3 million users.

Digg (dig.com): A user-driven site that lets users submit links and stories. Other Digg users vote them up or down and comment on them. More than 7.6 million visitors accessed Digg in June.

Experience Project (experienceproject.com): A free social networking website of online communities premised on connecting people through shared life experiences. Over 5.2 million real-life experiences have been collected as of June. Users can join communities organized around experiences and interests, and by city and region.

Facebook (facebook.com): The world’s largest, most popular social networking site with over 500 million members. Used to keep up with friends, upload an unlimited number of photos, share links and videos, and learn more about people and businesses.

Fast Pitch (fastpitch.com): A social network for business networking professionals to market themselves and their business’ press exposure, blogs, events and networks.

Flickr (flickr.com): The world’s premier photo sharing and hosting site. As of October 2009, it announced more than 4 billion images have been uploaded.

FriendFeed (friendfeed.com): A real-time aggregator that consolidates updates from social media, networking and bookmarking sites; blogs, micro-blogging, and other RSS feeds. Claims over one million monthly visitors.

Google (google.com): With more than a 65% market share it is the Internet’s No. 1 search engine. It also hosts more than 150 domains, many of which are designed specifically for businesses use.

LinkedIn (linkedin.com): The largest social site dedicated to professionals networking with fellow professionals. Claims over 75 million members in 200 countries, representing more than 150 industries.

MySpace (myspace.com): Originally geared for artists and musicians, it is now considered the No. 2 social networking site, claiming 122 million users a month—70 million of which are based in the U.S.

Twitter (twitter.com): The most popular micro-blogging community. Posts and links must be 140 characters or less. In April, announced more than 100 million users.

Quantcast (quantcast.com): A media measurement, web analytics service that allows users to view audience statistics for millions of websites.

Yahoo (yahoo.com): The most visited website on the Internet, with more than 412 million unique users and more than 3.4 billion page views per day on average.

YouTube (youtube.com): The No. 1 destination to watch, share and discuss original videos online with 2 billion viewers each day.