Social networking
sites enable users to build communities of friends and
professional colleagues. Members each typically create a “profile,” a Web page
for posting photos, videos, MP3 files, and text, and then share these profiles
with others on the service identified as their “friends” or contacts. Social
networking sites are highly interactive, offer real-time user control, rely on
user-generated content, and are broadly based on social participation and
sharing of content and opinions. Leading social networking sites include
Facebook, MySpace (with 500 million and 180 million global members respec-
tively in 2010), and LinkedIn (for professional contacts).
For many, social networking sites are the defining Web 2.0 application,
and one that will radically change how people spend their time online; how
people communicate and with whom; how business people stay in touch
with customers, suppliers, and employees; how providers of goods and
services learn about their customers; and how advertisers reach potential
customers. The large social networking sites are also morphing into
application development platforms where members can create and sell
software applications to other members of the community. Facebook alone
had over 1 million developers who created over 550,000 applications for
gaming, video sharing, and communicating with friends and family. We talk
more about business applications of social networking in Chapters 2 and 10,
and you can find social networking discussions in many other chapters of the
text. You can also find a more detailed discussion of Web 2.0 in our Learning
Tracks.
W e b 3 . 0 : T h e F u t u r e W e b
Every day about 110 million Americans enter 500 million queries search
engines. How many of these 500 million queries produce a meaningful result (a
useful answer in the first three listings)? Arguably, fewer than half. Google,
Yahoo, Microsoft, and Amazon are all trying to increase the odds of people find-
ing meaningful answers to search engine queries. But with over 100 billion Web
pages indexed, the means available for finding the information you really want
are quite primitive, based on the words used on the pages, and the relative pop-
ularity of the page among people who use those same search terms. In other
words, it’s hit and miss.
To a large extent, the future of the Web involves developing techniques to
make searching the 100 billion public Web pages more productive and
meaningful for ordinary people. Web 1.0 solved the problem of obtaining access
to information. Web 2.0 solved the problem of sharing that information with
others, and building new Web experiences.
Web 3.0
is the promise of a future
Web where all this digital information, all these contacts, can be woven together
into a single meaningful experience.
Sometimes this is referred to as the
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