http://docs.webplatform.org/wiki/Main_Page - already uses SocialProfile! Look further into how they are benefiting from user profiles?
reuse Flow? Will it be ready? Or at least comment on what we want from Flow.
reuse any OpenHatch code? Open question...
https://www.mediawiki.org/wiki/Wikimedia_Engineering/Project_documentation_howto - this is a starting point for the project/activity pages.
How does this hook into https://www.mediawiki.org/wiki/Volunteer_coordination_and_outreach/Openhatch_2013-02-27 ? This doesn't solve that. Matter of scope.
Privacy? - maybe multiple levels -- "yes, I want to receive notifications" versus not & "yes, I want to appear in listings" versus not appearing.
Tasks are items in the SMW database. Start with copy and paste from BZ/Gerrit/etc. Hook in to BZ API - not in the initial spec.