My broad theory at the moment:
Citizen X is us, whenever we act as information repeaters instead of as responders.
The Evoke network is about using information and connections to organize intelligent, effective responses to crises.
Citizen X is about exploiting access to information for (anonymous) glory.
From this week's episode, it appears that:
1. The Citizen X community is interested in any information that others might value--celebrity gossip, credit card numbers, actual citizen journalism
2. The Citizen X community runs through some kind of online network for rebroadcasting information
3. They value anonymity
4. There doesn't appear to be any overlap between their usernames and Evoke usernames... Yet! And that might be a function of the 24-36 hour refresh delay on member/post searches.
Here are the names we've seen-- Did I miss any?