I’d say it’s closer from a Flock to a tribe, because the conference would be a good time-sensitive event that would temporarily rally people on social media for its duration (via shares, tweets, coverage, etc) and then after the event it could either transition to ecosystem or a tribe depending on the intimacy level of the community.

The reason I say flock and not single serve, is single serve are really rapid one-off transactions and I think the act of co-creating would necessitate a collective gathering that would make it fit that category.

Does that make sense? I’m using your question to help stress test this framework, and I think that works, but check my thinking and let me know!