Definition of some popular social networks nowadays. People can read them and grab some new vocabulary about this new phenomenon

1. The Social Networking
phenomenon

2. It is an online social networking service. Its name comes
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 2004 by Mark Zuckerberg with
his college roommates and fellow Harvard University
students Eduardo Saverin, Andrew McCollum, Dustin
Moskovitz and Chris Hughes.

3. It is an online social networking and micro-blogging service
that enables users to send and read "tweets", which are
text messages limited to 140 characters.

4. It is a social networking website for people in
professional occupations.

5. It is a video-sharing website, created by three former
PayPal employees in 2005 and owned by Google since late
2006, on which users can upload, view and share videos.

6. It is an image hosting and video hosting website, and web
services suite that was created by Ludicorp in 2004 and
acquired by Yahoo! in 2005

7. It is an online virtual world developed by Linden Lab. It
was launched in 2003. A number of free client programs, or
Viewers enable Second Life users to interact with each
other through avatars.

8. Some useful
vocabularyç
www: World Wide Web– the same as the Internet
Online: you are connected to the Internet.
Offline: you are using your computer but are not connected to the
Internet.
Download: to get a program or files from the Internet and put them in
your computer.
Link: a word or a picture in a web site that takes you to another web site
when you click it.
Upload: to move or copy (a file, program, etc.) from a computer or device
to a usually larger computer or computer network.
Update: to change (something) by including the most recent information.
Tag: to add a character or set of characters to (a piece of text or data) in
order to identify or categorize it.
Hashtag: a word or phrase preceded by a hash sign (#), used on social
media sites such as Twitter to identify messages on a specific topic.