The Social Graph is described as the relationships created between humans on the web. Any social graph is based on a common relationship. That relationship is typically friendship on the majority of today's social networks, but may also possibly be based on family ties or group membership such as a sports team, volunteer organization, company, project, study or interest group, although several other possible social graph relationships (basically, any common points of reference) exist based around the more common statistical socio-demographics such as income, religion, ethnicity, etc.
According to Google's OpenSocial project: "The web is better when it's social" The web is more interesting when you can build apps that easily interact with your friends and colleagues. But with the trend towards more social applications also comes a growing list of site-specific APIs that developers must learn.
NEXUS is a SocialGraph Facebook Application which uses GraphViz to generate interactive graphs showing friends and friends-of-friends of an individual on Facebook, via the Facebook API.
The Lijit Explorer (or "bubble browser" as our team affectionately calls it) is an interactive, visual representation of a blog's network. (Notice that we didn't say a "Lijit user's" network, because you can, in fact, explore your way to blogs that aren't associated with a Lijit user.)
The display shows up to fifteen bubbles in each section (even if there are more), with the sections being defined as the following:
- Orange = "fans of" (blogs that link to the blog in the center of the display)
- Green = "friends" (blogs that link to the blog in the center of the display, to which the blog in the center also links back)
- Blue = "follows" (blogs to which the blog in the center of the display links)
Clicking on a blog from any section will bring it to the center and display its network. And beneath the blog in the center, you'll see an information box containing its URL and any other content it (or its owner) might offer.
The Lijit Explorer is a strangely entertaining way to discover the intricately entwined world of blogs. Enjoy bubble browsing!
Yahoo! Small World Experiment
- Small World Experiment: http://smallworld.sandbox.yahoo.com/index.php?lang=en 
- Creating accessible charts using canvas and jQuery: http://www.filamentgroup.com/lab/creating_accessible_charts_using_canvas_and_jquery/
- The Future of Search: Social Relevancy Rank: http://www.readwriteweb.com/archives/future_of_search_social_relevancy_rank.php
- google-sgnodemapper: http://code.google.com/p/google-sgnodemapper/
- Social Graph -- Concepts and Issues: http://www.readwriteweb.com/archives/social_graph_concepts_and_issues.php
- Thoughts on the Social Graph: http://bradfitz.com/social-graph-problem/
- Everloop promises - No child left without a social graph: http://www.socializedpr.com/everloop-promises-no-child-left-without-a-social-graph/
- Designing a Data Architecture to Support both Fast and Big Data: http://java.dzone.com/articles/designing-data-architecture
- OpenSocial API: http://code.google.com/apis/opensocial/ (DEPRECATED)
- Lijit Explorer (Display Explore Feature): http://www.lijit.com/help/explore/definition
- Yahoo, Facebook test “six degrees of separation” idea: http://www.zdnet.com/blog/facebook/yahoo-facebook-test-8220six-degrees-of-separation-8221-idea/2678