LAST EDITED ON Feb-25-09 AT 08:34 AM (PST)
 
Here's a wide variety of resources to help you learn about tons of social marketing opportunities. I bought rights to these and will be adding more as time permits, so check back.

ADDED 2/25/09

Google Knol - "Knol is a Google project which aims to include user-written articles on a range of topics. Knol pages are "meant to be the first thing someone who searches for this topic for the first time will want to read".
Video: http://www.dombom.com/iframes/SocialMarketing/googleknolvideo/googleknolvideo/

Mr. Wong - Recommended by Top Hat Bob - Use Mister Wong to search for the best websites on the web. You'll also find a list of popular sites covering a variety of topics on the homepage for even more inspiration.
Video: http://www.dombom.com/iframes/SocialMarketing/misterwongvideo

JumpTags - "Jumptags.com is a revolutionary Web 2.0 social bookmarking web service for collecting, storing, sharing and distributing web bookmarks, notes, rss feeds..."
Video: http://www.dombom.com/iframes/SocialMarketing/jumptagsvideo

ADDED 12/31/08

Veoh - www.veoh.com Veoh is an open platform for content publishers of all sizes and sophistication who want to reach tomorrow’s television audience. Currently more than 100,000 publishers - from forward-thinking, well-known entertainment brands to independent, made-for-the-Web producers - use Veoh to connect with an audience of more than 24 million engaged, influential viewers. In addition, Veoh’s unique publisher optimization program gives publishers powerful tools to help them raise awareness of their content and cultivate loyal viewing audiences.
Video: http://dombom.com/iframes/SocialMarketing/veohcom/

CommonGate - http://commongate.com/ - "connects people like you with other people who share common interests and passions. You can use CommonGate in many different ways: as a social network, a blog, a forum, a wiki, your personal page and more!"
Video: http://www.dombom.com/iframes/SocialMarketing/commongatecom/

Clipfire - www.clipfire.com The goal of Clipfire is to help users find the shopping websites with the best
Video: http://www.dombom.com/iframes/SocialMarketing/clipfirecom/

SocialTwist - www.socialtwist.com
Video: http://www.dombom.com/iframes/SocialMarketing/socialtwist/

Install Flock - www.flock.com Install Flock social web browser
Video: http://www.dombom.com/iframes/SocialMarketing/installflock/

Using Flock
Video: http://www.dombom.com/iframes/SocialMarketing/usingflock/

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43Things - www.43things.com - This is actually a favorite of a couple of SEO experts I know...
Video: http://dombom.com/iframes/SocialMarketing/43things/

BlinkList gives you a button to “blink” every time you find a page you want to remember. They then give you a website on which you can track and sort all your “blinks”. Access them from anywhere, from any computer, and share them with your friends and to meet people with similar interests.
Video: http://dombom.com/iframes/SocialMarketing/blinklist/

Bravisa gives you a free social commerce application and provides you with products, so you can operate your own online store anywhere on the web. You decide your profits by picking your own prices.
Video: http://dombom.com/iframes/SocialMarketing/bravisa/

Broadcaster - The social video network with news, music, movies, video clips, video sharing, interactive 2-way webcam chat, video tools and more.
Video: http://dombom.com/iframes/SocialMarketing/broadcaster/

Delicious - “The biggest collection of bookmarks in the universe.” See what’s popular for any given tag. Share and store your own favorites.
Video: http://dombom.com/iframes/SocialMarketing/delicious/

Ecademy - all about business. Network to share knowledge and opportunities. Improve your marketing skills and your position on the web.
Video: http://dombom.com/iframes/SocialMarketing/ecademy/

Eons - Information, tools, resources and communities for “baby boomers” – focuses on people over the age of 50.
Video: http://dombom.com/iframes/SocialMarketing/eons/

Fotolog - Over 21 million members worldwide. A community that shares photos and makes friends through interconnected photo diaries and blogs.
Video: http://dombom.com/iframes/SocialMarketing/fotolog/

Furl is a social bookmarking site that makes it easy to save, share, and explore favorite web pages.
Video: http://dombom.com/iframes/SocialMarketing/furl/

Gather - Design, features and content are geared towards the “over-30” crowd. Specialized privacy settings, interest groups and news feeds guarantee you can learn and share what you want with whom you want.
Video: http://dombom.com/iframes/SocialMarketing/gather/

GoogleVideo - Google’s principle video sharing site prior to their purchase of YouTube.
Video: http://dombom.com/iframes/SocialMarketing/googlevideo/

Kaboodle is a social community of people who love to shop. Discover new items and organize shopping lists, get recommendations from people with similar style, find discounts on popular products. Launched in 2006, Kaboodle has 550,000 registered users and over 7 million monthly visitors.
Video: http://dombom.com/iframes/SocialMarketing/kaboodle/

Linked In - Over 25 million professionals use LinkedIn to exchange information, ideas and opportunities. The site provides a setting to network for job candidates, industry experts and business partners. Registered users can also use LinkedIn to maintain a list of contacts details.
Video: http://dombom.com/iframes/SocialMarketing/linkedin/

Meetup says: “Maybe it’s time for a little less face-to-screen and a little more face-to-face.” Meetup is about really bringing people together. For moms, for motorcycles, for ballroom dancing, for a dog show, for a picnic or a parade... Meetup helps organize it and bring everyone together.
Video: http://dombom.com/iframes/SocialMarketing/meetup/

Mobango - With MOBANGO, you have immediate access to thousands of personal files provided by users around the world. You can publish, convert, and share personal content of all types for your cell phone - videos, photos, ringtones, software, games. Upload from your PC and, in a few, simple steps, use MOBANGO to convert and adapt it for your cell phone – all free of charge!
Video: http://dombom.com/iframes/SocialMarketing/mobango/

Multiply provides a family-friendly way to create, share and discuss your blog, photos and videos with the people you know in a secure online environment.
Video: http://dombom.com/iframes/SocialMarketing/multiply/

Ning lets you create and customize an online social network, then share it with like-minded individuals and groups. Founded in October, 2004, Ning now powers the largest number of social networks on the internet. Want new features for your network? The Ning Platform allows you to DIY
Video: http://dombom.com/iframes/SocialMarketing/ning/

Reddit provides a collaborative record of what’s new and popular online. Readers vote on stories and categories they like or dislike or they can submit their own stories. In this way, the results are very much decided by the efforts of the group.
Video: http://dombom.com/iframes/SocialMarketing/reddit/

Ryze - Members get a free home page from which they can network, sending messages to other members. They can also join special business networks related to their industry, interests or location.
Video: http://dombom.com/iframes/SocialMarketing/ryze/

Simpy is a social bookmarking service. You can save, tag and search your own bookmarks and notes or browse and search other users' links and tags. You can be open and share your links with others, or keep them private. You can also find like-minded people, discover new and interesting sites, publish your bookmarks, and much more. The service is 100% free and even free of advertising for registered users.
Video: http://dombom.com/iframes/SocialMarketing/simpy/

Squidoo - Whether you’re new to the internet or an experienced webmaster, you have to appreciate the fun and simplicity of making a “lens” – focusing on your topic of choice – on the ever-popular Squidoo. The site now has over 700,000 pages and, because of its traffic, will give you a boost if you include a link from your lens back to your website.
Video: http://dombom.com/iframes/SocialMarketing/squidoo/

StumbleUpon - According to StumbleUpon, using search engines is too much work and yields pages of poor results. StumbleUpon members use a web browser plugin that allows users to discover and rate webpages, photos, videos, and news articles. So each time members click their 'Stumble' button, they are taken directly to web sites matching their personal interests and preferences. Using a combination of human opinions and machine learning, StumbleUpon presents only web sites which have been suggested by other like-minded Stumblers.
Video: http://dombom.com/iframes/SocialMarketing/stumbleupon/

Technorati is the internet’s leading blog search engine and most comprehensive source of information on the blogosphere. The site indexes more than 1.5 million new blog posts in real time and introduce millions of readers to blog and social media content.
Video: http://dombom.com/iframes/SocialMarketing/technorati/

Twitter - A social networking and microblogging service using instant messaging, SMS or a web interface, Twitter provides a way for friends, family, and co–workers to communicate and stay connected through the exchange of quick, frequent answers to one simple question: What are you doing?
Video: http://dombom.com/iframes/SocialMarketing/twitter/

Yahoo360
Video: http://dombom.com/iframes/SocialMarketing/yahoo360/

Yahoo Answers is a site where people ask and answer questions on any topic. In many ways, this gives greater freedom than a search engine to find the answer you are looking for. You can also share your facts and opinions, adding your personal experiences...
Video: http://dombom.com/iframes/SocialMarketing/yahooanswers/

Yoono is a web browser plug-in that acts as a social aggregator by gathering social networking information and keeping it in one place. It allows the user to instantly chat with any friend across multiple networks, easily maintain their social networks, receive live updates from friends and discover new websites. Yoono acts as a universal remote for social networks allowing you to do less maintaining and more socializing.
Video: http://dombom.com/iframes/SocialMarketing/yoono/