1. a taxonomy of (a small sample of) social media tools
   1. virtualisation
      1. SecondLife
   2. publishing tools
      1. publishing tool - producing
         1. publishing tool - collaborative
            1. Wikkawiki
            2. Wikipedia
            3. Google Docs / Apps
         2. blogging - Wordpress
         3. microblogging - Twitter
         4. aggregators
            1. Glogster
            2. Facebook
         5. semantic
            1. Wordle
      2. publishing tools - consuming
         1. Flickr
         2. Google maps - layers
         3. Wikipedia
   3. aggregator of tools - elgg
      1. Elgg
      2. Facebook
      3. Edmodo
      4. Mahara*
      5. Moodle*
   4. dialectic tools
      1. simple
         1. discussion forum - threaded, e.g., Fronter*
         2. Todaysmeet
      2. semantic
         1. Debategraph
         2. Wikkawiki / Freemind
         3. Mind42
      3. aggregated discussion tools
         1. Voicethread
         2. Joinnet
2. * The tools marked might be considered to fall within a different paradigm, that is, provision for e-learning / a virtual learning environment; I believe that they (or parts thereof) can still be used in a way that conforms to our ideas about social media.