• A social network is a social structure made up of a
set of social actors (such as individuals or
organizations) and a set of the dyadic ties between
these actors. The social network perspective
provides a set of methods for analyzing the structure
of whole social entities as well as a variety of
theories explaining the patterns observed in these
structures. The study of these structures uses social
network analysis to identify local and global
patterns, locate influential entities, and examine
• Facebook is an online social networking service. Its name stems
from the colloquial name for the book given to students at the
start of the academic year by some American university
administrations to help students get to know each other.
Facebook was founded in February 2004 by Mark Zuckerberg
with his college roommates and fellow Harvard University
students Eduardo Saverin, Andrew McCollum, Dustin Moskovitz
and Chris Hughes. The website's membership was initially
limited by the founders to Harvard students, but was expanded
to other colleges in the Boston area, the Ivy League, and Stanford
University. It gradually added support for students at various
other universities before opening to high school students, and
eventually to anyone aged 13 and over.
• Twitter is an online social networking service
and microblogging service that enables its users
to send and read text-based messages of up to
140 characters, known as "tweets".
• Myspace (stylized as myspace, previously
stylized as MySpace and My_____)is a social
networking service with a strong music
emphasis owned by Specific Media LLC and pop
music singer and actor Justin Timberlake.
Myspace was launched in August 2003 and is
headquartered in Beverly Hills, California. In
June 2012, Myspace had 25 million unique U.S.
• Myspace had a significant influence on pop
culture and music and created a gaming
platform that launched the successes of Zynga
and Rock You, among others. The site also
started the trend of creating unique URLs for
companies and artists.
• LinkedIn /ˌlɪŋkt.ˌɪn/ is a social networking
website for people in professional occupations.
Founded in December 2002 and launched on
May 5, 2003, it is mainly used for professional
networking. As of June 2013, LinkedIn reports
more than 225 million acquired users in more
than 200 countries and territories.
• The site is available in 20 languages, including
English, French, German, Italian, Portuguese,
Spanish, Dutch, Swedish, Romanian, Russian,
Turkish, Japanese, Czech, Polish, Korean,
Indonesian, Malay, and Tagalog. As of
2 July 2013 (2013-07-02), Quantcast reports
LinkedIn has 65.6 million monthly unique U.S.
visitors and 178.4 million globally. In June 2011,
LinkedIn had 33.9 million unique visitors, up 63
percent from a year earlier and surpassing MySpace.
LinkedIn filed for an initial public offering in
January 2011 and traded its first shares on May 19,
2011, under the NYSE symbol "LNKD