1. provider
   1. concepts
      1. federation
      2. delegation
   2. technical specs
      1. OpenID
         1. Concepts
            1. OP
            2. RP
         2. Attribute Exchange
      2. OAuth
         1. Apps Examples
            1. FireEagle
            2. Praized
            3. Foursquare
   3. managing
      1. abuse
      2. spam
      3. theft
      4. churn
      5. reporting
      6. trending
      7. metrics
   4. best practices / examples
      1. Google
      2. Yahoo!
      3. Twitter
      4. Windows Live (Hotmail)
      5. AOL
   5. exceptions
      1. Facebook
   6. storing
      1. access control
      2. policy
         1. privacy
         2. terms of service
      3. scaling
         1. sharding
         2. caching
         3. distributing
2. platforms
   1. web
   2. mobile
3. personalization
4. user
   1. ux
      1. facets
      2. contexts (app specific)
      3. personas?
   2. profile
      1. settings
      2. public/private
      3. contact
      4. verified?
   3. portability
      1. poco
      2. import/export
      3. foaf
   4. concerns
      1. privacy
      2. anonymity
      3. revoking
   5. key info
      1. name
      2. location
      3. email
      4. phone/mobile
5. social graph
   1. friends
      1. find
      2. connect
   2. social validation
6. reputation
   1. trust
   2. history
7. merchants
   1. same as users
   2. with special needs
8. activities
   1. claim ID (users, merchants)