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Facebook is one of the most popular social networking (webs, sites, pages, portlas)
in the world, allowing users to contact each other, (post, write)
news, send
(instant, lightning, short, fast) messages and keep in touch in many other ways.
The site was
founded in 2004 by Mark Zuckerberg, a computer science student at
Harvard, and his college roommates. At first, the site was only
available to Harvard students but since 2006 Facebook has been open to
all: anybody thirteen years old or older with a valid email address can (find, open, access, see)
the site. The site has been developed constantly ever since and new (elements, features, offers, parts)
are added regularly. In 2010 Facebook had around 600 million active
users and its value has been estimated at over $40 billion.
Facebook has had some problems, however. The
has been (producer, company, partner, provider) criticised in the past for not protecting the (particular, special, secret, personal)
information that users include in their (profiles, status, user names, groups)
and it has been blocked by numerous countries at different times for
political and religious reasons. The site is also often blocked by
companies worried at how much time their workers spend (connected, crashed, online, networked).