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FOAF
for Social Network
     Portability

  Uldis Bojars (captsolo@gmail.com)
WebCamp on Social Network Portability
     Cork, Ireland - March 2, 2008
Introduction
Uldis Bojārs
  @ DERI Galway


• FOAF - topic of this talk
• SIOC - what I am working on
http://en.wikipedia.org/wiki/Linked_Data
Friend of a Friend
Information about:

 • Person
 • Social Network / Relations
 • Groups
Friend of a Friend
Information about:

 • Person
 • Social Network / Relations
 • Groups (multiple)
 • ... and more ...
Richer Info Needed?
• RDF allows us to combine FOAF
  with other vocabularies
• XFN, Relations vocabulary, ...
Richer Info Needed?
• RDF allows us to combine FOAF
  with other vocabularies
• XFN, Relations vocabulary, ...
  RDF = Information, Concentrated
Richer Info Needed?
•   An example - Morten’s FOAF profile:

    http://www.wasab.dk/morten/blog/archives/author/mortenf/
Social Network
          Portability
Components (data):

 • A way to identify a person (across sites)
  - privacy
 • A way to describe a social network
  - relations between people
Identifying Properties
• E-Mail address (private)
• Hash of e-mail (semi-public)
• URLs (public)
• ...
Social Network
          Portability
Components (tools):

 • Tools / Services (do the actual “magic”)
 • Data providers
  - opening up social media sites
 • Data users / consumers
Workflow
1. Parse FOAF data (from Site A)
2. Extract a list of friends and
   some data for identifying them
3. Compare this identifying data with
   a registry of users on Site B,
   report matching users
Parsing FOAF data?
Python:
  import RDF
  # using Redland Python bindings (librdf.org)
  m = RDF.Model()
  m.load('http://danbri.org/foaf.rdf')
Finding Friends? :)
SPARQL:
  SELECT ?person ?mbox
  WHERE {
    <danbri> foaf:knows ?person .
    ?person foaf:mbox ?mbox .
  }
Case Study: LiveJournal
•   Data about a person (FOAF) - ✓
•   Social network (FOAF) - ✓
•   Identifying information ...
      Difficulty: this data (foaf:mbox_sha1sum)
      is spread across friends’ profiles.
      Must be collected together before use.
Distributed Social
        Information
• What about using Flickr, Twitter, ... account
  URLs as identifyers?
 - Identifying properties are only useful if
   other sites also knows this data
 - Entering all the URLs again and again?!
• Describe these accounts once
 - Applications can get this info from your
   homepage (e.g., described in FOAF)
http://apassant.net/blog/2008/01/12/one-foaf-fits-all/
Open Questions
• Who owns this information?
 • You should have ability to backup and
      reuse your social network info
      (you own the data!)
• Privacy
• ... ... ...
Thank you!
• http://wiki.foaf-project.org/FAQ

• http://captsolo.net/info

• #webcamp
  (look for more info tagged “webcamp”)

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FOAF for Social Network Portability

  • 1. FOAF for Social Network Portability Uldis Bojars (captsolo@gmail.com) WebCamp on Social Network Portability Cork, Ireland - March 2, 2008
  • 2. Introduction Uldis Bojārs @ DERI Galway • FOAF - topic of this talk • SIOC - what I am working on
  • 4. Friend of a Friend Information about: • Person • Social Network / Relations • Groups
  • 5. Friend of a Friend Information about: • Person • Social Network / Relations • Groups (multiple) • ... and more ...
  • 6. Richer Info Needed? • RDF allows us to combine FOAF with other vocabularies • XFN, Relations vocabulary, ...
  • 7. Richer Info Needed? • RDF allows us to combine FOAF with other vocabularies • XFN, Relations vocabulary, ... RDF = Information, Concentrated
  • 8. Richer Info Needed? • An example - Morten’s FOAF profile: http://www.wasab.dk/morten/blog/archives/author/mortenf/
  • 9. Social Network Portability Components (data): • A way to identify a person (across sites) - privacy • A way to describe a social network - relations between people
  • 10. Identifying Properties • E-Mail address (private) • Hash of e-mail (semi-public) • URLs (public) • ...
  • 11. Social Network Portability Components (tools): • Tools / Services (do the actual “magic”) • Data providers - opening up social media sites • Data users / consumers
  • 12. Workflow 1. Parse FOAF data (from Site A) 2. Extract a list of friends and some data for identifying them 3. Compare this identifying data with a registry of users on Site B, report matching users
  • 13. Parsing FOAF data? Python: import RDF # using Redland Python bindings (librdf.org) m = RDF.Model() m.load('http://danbri.org/foaf.rdf')
  • 14. Finding Friends? :) SPARQL: SELECT ?person ?mbox WHERE { <danbri> foaf:knows ?person . ?person foaf:mbox ?mbox . }
  • 15. Case Study: LiveJournal • Data about a person (FOAF) - ✓ • Social network (FOAF) - ✓ • Identifying information ... Difficulty: this data (foaf:mbox_sha1sum) is spread across friends’ profiles. Must be collected together before use.
  • 16. Distributed Social Information • What about using Flickr, Twitter, ... account URLs as identifyers? - Identifying properties are only useful if other sites also knows this data - Entering all the URLs again and again?! • Describe these accounts once - Applications can get this info from your homepage (e.g., described in FOAF)
  • 18. Open Questions • Who owns this information? • You should have ability to backup and reuse your social network info (you own the data!) • Privacy • ... ... ...
  • 19. Thank you! • http://wiki.foaf-project.org/FAQ • http://captsolo.net/info • #webcamp (look for more info tagged “webcamp”)