1 Social Network

social network is a social structure made of nodes (which are generally individuals or organizations) that are tied by one or more specific types of relations, such as values, visions, idea, financial exchange, friends, kinship, dislike, trade, web links, sexual relations, disease transmission (epidemiology), or airline routes.
Social network analysis views social relationships in terms of nodes and ties. Nodes are the individual actors within the networks, and ties are the relationships between the actors. There can be many kinds of ties between the nodes. Research in a number of academic fields has shown that social networks operate on many levels, from families up to the level of nations, and play a critical role in determining the way problems are solved, organizations are run, and the degree to which individuals succeed in achieving their goals.
In its simplest form, a social network is a map of all of the relevant ties between the nodes being studied. The network can also be used to determine the social capital of individual actors. These concepts are often displayed in a social network diagram, where nodes are the points and ties are the lines.

2 Zilo

Networks Inc. is an integrated entertainment and marketing television network aimed at college students and young adults. Zilo includes:
"Zilo TV", a college television network that provides 12 hours of programming per week to over 5.5 million campus-based cable subscribers and 3.2 million broadcast households.
"Zilo Live", a series of multi-campus, participatory event franchises.
"Zilo Online", a broadband website for college students with original streaming content.

wists

Social Shopping is a method of e-commerce in which consumers shop in a social networking environment similar to MySpace.
Social Shopping is based on the principles outlined in the wisdom of crowds where a large group of users can recommend products to each other and between them work out what to buy and which ones have the most buzz. Some of the leading companies in this field include Wists, Stylehive, ThisNext, StyleFeeder, Kaboodle and ZEBO.

Another Social network

43 things
43 Things or 43things.com is a social networking site that is built on the principles of tagging, rather than creating explicit interpersonal links (as seen in Friendster and Orkut). Users create accounts and then list a number of goals or hopes; these goals are parsed by a lexer and connected to other people's goals that are constructed with similar words or ideas. This concept is also known as folksonomy.

[edit] Recognition
In 2005, 43 Things won the Webby Award for the best Social Networking site.
On April 27, 2007, 43Things reached the 1,000,000 registered users mark.

[edit] Launches
43 Things was launched on January 1, 2005, by the Robot Co-op, a small company based in Seattle founded by prominent blogger "Erik Benson", Maktub keyboardist Daniel Spils, and former Amazon.com and Microsoft executive Josh Petersen. The site was developed using the Ruby programming language and the Ruby on Rails framework. The development of the site (and company) was chronicled on the company's blog. The first version of the site was released 43 days before January 1, with a stripped down text interface asking "43 days till the new year. What do you want to do with your life?" Hundreds of thousands of users browsed the site before the official launch - leading to news coverage in several countries.
"43 Places", a sister site, was launched June 27, 2005.
"43 People", another sister site, was launched in August, 2005.

[edit] Press coverage
43 Things and statements from developer Erik Benson were given a prime spot in an article on tags written by Katharine Mieszkowski, a senior writer for Salon.com. After publication Mieszkowski received an anonymous email tipping her off to investigate how the Robot Co-op was funded. Mieszkowski called 43 Things founder Erik Benson at his home at 7:45 am demanding to know if 43 Things was funded by Amazon.com. She published her version of this conversation in a follow up piece in Salon.com entitled "Amazon's 43 Secrets".
That article included confirmation from Amazon.com and The Robot Co-op's CEO that internet bookseller and web giant Amazon.com was the sole investor in The Robot Co-op. Amazon.com declined to comment on their investment, but Mieszkowski speculated that they plan to use this site to further customize their individual marketing and site preferences for their users. Mieszkowski did not restate the glowing material from her prior tagging article that had described what the Robot Co-op was building. Mieszkowski implied that Amazon is being somewhat underhanded in disguising their use of a pseudo-independent site, as many users are entering data about their planned purchases, without realizing that they are giving this information to a potential marketing machine, rather than a social website. Mieszkowski never announced who the anonymous tipster was or speculated about their motivations (or intentions) in leaking this announcement to the press ahead of The Robot Co-op or Amazon.com's publicity schedule.
Prominent blogger Jason Kottke weighed in on the "43 Things Amazon Conspiracy" by asserting that the history of the site from inception to release was chronicled on a public blog, that the employees of the Robot Co-op all keep blogs, and that all significant information on 43 Things is available via the internet, if not on the site itself or in the interview with Benson. The three day period of attention from Salon and other media was asserted to have led to a 35% increase in users of 43 Things.