Explanation of Social Media and its impact

People’s Voice Media uses the term social media to explain what it is trying to do.  I thought it would be usefull try and explain it. Find below links to some explanations.  Please feel to add comments or contact me for a more detailed discussion.

Here is a video’s that explain what social media is

Social Media in Plain English

There is also a good overview in poster form

and here is the Wikipedia defination