This is an excellent summary of why you should care about social media:

*(Warning: implied profanity throughout)*
[What the F**K is Social Media: One Year Later](http://www.slideshare.net/mzkagan/what-the-fk-is-social-media-one-year-later "What the F**K is Social Media: One Year Later")
View more [documents](http://www.slideshare.net/) from [Marta Kagan](http://www.slideshare.net/mzkagan).
Stolen, without shame, [from Robin](http://www.cybersoc.com/2009/08/excellent-presentation-provides-intro-and-insight-re-social-media.html)