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Viral marketing uses internet relationships to promote products, people and events. It relies on people telling their friends about things in order to create 'buzz.' Effective viral marketing is inexpensive, and the results are priceless.

How to create a group on Facebook | eHow.com

http://www.ehow.com/internet/

30+ More Ways to Create Twitter Groups

Earlier this year we showed you how to create groups for Twitter . http://mashable.com/2009/07/13/more-twitter-groups/
http://www.cluewagon.com/2009/07/linkedin-101-using-groups/

LinkedIn 101: Using Groups

JENNIFER: Joining a LinkedIn group (in general) could be helpful in a number of ways.

A Few Good Tools for Sharing Files with Distributed Groups

http://www.techsoup.org/learningcenter/software/page8378.cfm?cg=telegreen&sg=week4#SharingFiles This article — originally published in 2008 — is courtesy of Idealware , which provides candid information to help nonprofits choose effective software.
Social interaction online is not very sophisticated. The news feed model of conversation has taken over the social web, from Facebook to Twitter to FriendFeed to MySpace, but by itself it doesn't serve us very well.

Groups: The Secret Weapon of the Social Web - ReadWriteWeb

http://www.readwriteweb.com/archives/groups_the_secret_weapon_of_the_social_web.php
http://www.tweetizen.com/ Tweetizen is a simple web-based tool designed to help you filter the daily influx of tweets, and easily find the ones that are relevant to you.

Tweetizen -Discover Tweets That Matter To You

GroupieGuide: Free Website-In-a-Box for Groups [Invites]

Chances are you either organize your own group or consider yourself a member of one. There’s a variety of existing options available for setting up an online presence for your group, but one new service aims to give groupies a free way to rally around each other with an instant website. GroupieGuide , which has launched in private alpha, offers a neatly organized home for your group, complete with compartments for news, pictures, discussions, and events. http://mashable.com/2009/02/16/groupieguide/
http://mashable.com/2009/02/15/twitter-groups-3/

HOW TO: Create Groups for Twitter

One of the most demanded features for Twitter has been the ability to create groups, allowing members to focus on different sets of people they’re following. For example, you could create groups for all of your fantasy league friends, colleagues at work, friends in real life, family members, and so on. Because Twitter still does not provide any group feature, it has opened the floodgates for countless third party solutions.

Bill Paying: De-Bee Tracks Shared Group Expenses

http://lifehacker.com/5135539/de+bee-tracks-shared-group-expenses De-Bee is a simple and free web-based expense tracker. Sign up, invite friends, and share expenses more easily.
Guest post by Julius Solaris , a community manager and social media expert. Julius blogs at Event Manager Blog and manages the Linkedin Event Planning and Management group, which boasts more than 5300 event professionals from around the world. I have always been impressed by his entreprise, by his ability to run his own buisness and his obvious commitment to creating, enlarging and cultivating his community.

Top ten tips on how to manage a Linkedin group « These Digital T

http://johnwelsh.wordpress.com/2009/01/05/top-ten-tips-on-how-to-manage-a-linkedin-group/

Create Your Own Social Network for Conferences, Events, Groups o

CrowdVine, founded in 2007, builds simple and powerful social software to help people connect.