1.
The great way to describe social media is to smash it down. The
media is the one type of an instrument on communication such
as Radio or Newspapers, so the social media would be a social
instrument of communication.
Think of normal media as a single-way where you can listen to
a report on television, read a newspaper etc. but you have very
limited resources to give your ideas on the topic.
On the other site Social Media, which is allows two-way street
that enables you the facility to communicate too.

2.
 On the web social media is such a very broad term; it covers a
large range of websites. One of the ordinary link between these
websites is that you are capable to interact with the website as
well as other visitors.

3.
 Social Bookmarking sites such as Blink List, Folkd, Delicious
which is interact by tagging websites and searching during
website bookmarked by other peoples.
 Social News sites such as Reddit, Digg, Propeller which is
interact by voting for articles and commenting on them.
 Social Networking sites such as Facebook, Twitter, LinkedIn
which is interact by adding friends, commenting on profiles,
joining groups and discussions.

4.
 Social Photo and Video Sharing sites such as Pinterest, Flickr,
YouTube which is interact by sharing photos and videos or
commenting on users submissions.
 Some Wikis sites such as Wikia, Wikipedia which is interact by
adding articles and editing accessible articles and these websites
are not the only social media websites. Any websites that invites
you to interact with the sites and with other visitors falls into the
meaning of social media.

5.
 The social media is essential heart of online social websites and
applications reproduce. Most of traditional media contains
social mechanisms like comment fields for users. The term social
media is likely to lose meaning as the social aspect of the web.

6.
 Follow me on Google Plus:
https://plus.google.com/114442980130789000265/
 My Website:
http://socialmediainfographic.blogspot.com/