On Friday night, Jo sent me a tweet about a possible approach, using seeding tracking URLs into a network. That set me thinking, and so far, this is what I've come up with:
Tagging: Use a unique tag and follow the progress of a tweet across networks using Twittersearch, Summize, Tweetscan or Twemes.
For URL tracking, we could use Twitt(url)y. (I'm not sure that Twitterfeed is needed Jo, we can just seed the ping URLs manually).
To track locality: Twittermap and Twitterlocal.
We also plan to use various network visualization tools, such as Tweetwheel or something else, and del.icio.us network explorer.
All I need to do now is figure out how to phrase all this for the research ethics form!