Breaking it down/covering ground

What does Social Media encompass?

any application for user uploaded data 

  

Blogging (Wordpress, Blogspot)

Micro Blogging (Twitter)
Photo Sharing (Flicker, Picasa)
Video Sharing (You Tube)
Podcasts (Podcast.com)
Widgets
Social Networking (Facebook, Myspace, Linkedin)
Chat Rooms(Chatroulette, deviantART)
Message Boards(phpBB, epsqart)
RSS Feeds(Google Reader)

Categories sourced from http://www.slideshare.net/Debask/social-media-and-engagement-strategies-for-online-campaigns

and other categories I'm adding is Geoblogging (Brightkite, Gowalla, Foursquare) and I don't know... Geotagging? (Google Maps, Event map) Wikis (Wikipedia, Instructables) and do I dare mention virtual communities (second life) which I'm sure will aid your career

There are also management applications which are worth noting (hootsuite)