Hopefully, this would be implemented in a manner that provides Facebook members to set controls that determine the level of sharing of relationship connections, including sharing of one's social graph externally not just to FB apps. It's not just Facebook apps I would be concerned about but what might be made available via Facebook Connect. I also wonder who being classified as a "data controller" will influence how Facebook would implement this type of capability. Interesting, I also wonder if any meta data would be shared (e.g., name of the list on which someone is associated with - how many different lists is someone one, etc).
Today, during the Filtering the Stream roundtable at our RealTime CrunchUp, Seesmic’s Loic Le Meur asked why Facebook isn’t giving third parties access to their Friend Lists. Obviously, that’s a good question now that Twitter has starting giving third parties access to its Lists feature via an API. Normally, you’d expect a canned response along the lines of “we may do that in the future” or “we’re thinking about it,” but Facebook’s VP of Platform Bret Taylor was much more candid.
Taylor said that Le Meur’s request seemed “reasonable” and continued “we should do that.” “We’re not working on that. But we should be,” he continued. So there you go, done deal. Great. It would seem that soon, third parties should have access to the list filters that Facebook uses.