I hope this can help :)

2. • Electronic mail, most commonly referred to
as email or e-mail since ca. 1993, is a method
of exchanging digital messages from an author
to one or more recipients.

3. • The term "wiki" comes from the Hawaiian
phrase, "wiki wiki," which means "super fast.“
• A wiki is a Web site that allows users to add
and update content on the site using their
own Web browser.

4. • It is tagging a website and saving it for later.
Instead of saving them to your web browser,
you are saving them to the web.

5. • Stands for "Hyper-Text Markup Language."
This is the language that Web pages are
written in.
• Also known as hypertext documents, Web
pages must conform to the rules of HTML in
order to be displayed correctly in a Web
browser.

6. • A podcast or netcast is a digital
medium consisting of an episodic series
of audio, video, PDF, or ePub files subscribed
to and downloaded through web
syndication or streamed online to a computer
or mobile device.

7. • Stands for "Voice Over Internet Protocol," and
is often pronounced "voip.“
• VoIP is basically a telephone connection over
the Internet. The data is sent digitally, using
the Internet Protocol (IP) instead of analog
telephone lines.

8. • Online chat may refer to any kind
of communication over the Internet that
offers a real-time transmission
of text messages from sender to receiver.
• Chat messages are generally short in order to
enable other participants to respond quickly.

9. • It stands for “World Wide Web.”
• It is NOT a synonym of the Internet, but a
subset.
• It consists of pages that can be accessed using
a Web browser.

10. • This happens when a multimedia file is played
back without completely downloaded.

11. • A truncation of the expression web log.
• It is a discussion site published on the World
Wide Web and consists of discrete entries.

12. • 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.
• Social networking is just basically utilizing
social networks to express your thoughts, get
information and communicate with others.

13. • Abbreviation of Uniform Resource Locator
(URL) it is the global
address of documents and other resources on
the World Wide Web.

14. • A web feed (or news feed) is a data format
used for providing users with frequently
updated content.

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http://en.wikipedia.org/wiki/Email
http://www.techterms.com/definition/wiki
http://webtrends.about.com/od/socialbookmarking101/p/aboutsocialtags.htm
http://www.techterms.com/definition/html
http://en.wikipedia.org/wiki/Podcast
http://www.techterms.com/definition/voip
http://en.wikipedia.org/wiki/Online_chat
http://www.techterms.com/definition/www
http://en.wikipedia.org/wiki/Social_network
http://en.wikipedia.org/wiki/Web_feed
http://www.webopedia.com/TERM/U/URL.html
http://en.wikipedia.org/wiki/Web_feed