internet privacy

I want to hold some kinda workshop/collaborative brainstorming to help sort out ways to build confidence in a web anonymity and/or verification bank.
A list of issues I've personally seen this apply to:
- how to get gang members and/or victims to trust that a CeaseFire crowdsourced neighborhood activity website isn't recording their identity?
- what's the right level of detail to share in a diet/exercise monitoring group app?
- in Facebook, as well as every mobile app project I've designed: how to give users detailed control over which bits of info (profile, activity, network, etc) are shared with whom (public, friends, specific individuals, custom groups), without overloading them with a complex decision tree?

A list of participants to get all the necessary viewpoints:
- somebody who has worked for Verisign or any of its ilk
- a couple programmers
- interaction designers (of course)
- one of those behavioral econs, or anybody familiar with the psychology of trust
- somebody from a social networking anything (Ash Bhoopathy?)
- a couple average users
- somebody who doesn't use online services because of trust reasons
- somebody who's had their identity stolen