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Microsoft Research Faculty Summit 2008
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Jennifer GolbeckAssistant Professor, College of Information StudiesUniversity of Maryland, College Park
Social Networks on the Semantic Web
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The Semantic Web
One big goal of the Semantic Web: Represent knowledge in a standard, machine processable formatAggregate knowledge distributed across the web into a single knowledge modelReason over that knowledge
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Social Networks on the Semantic Web
FOAF (Friend Of A Friend) A simple ontology for representing information about people and who they know
About 20,000,000 social network profiles are available in FOAF formatApproximately 60% of all semantic web data is FOAF data
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Is FOAF a Success Story?
FOAF is a huge part of the Semantic WebIt is presented frequently as a success story of the Semantic WebBUT - it is only a success if it demonstrates that the goals of the Semantic Web are being achieved
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Experiment: Aggregate FOAF
FOAF is automatically generated by many social networking websites
Advogato Buzznet DeadJournal eCademy FilmTrust
Can these networks be connected through people who have profiles on multiple sites?
GreatestJournal InsaneJournal LiveJournal LJ.Rossia.org Minilog.com Tribe
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Semantics of FOAF
Inverse Functional Propertiesfoaf:mbox_sha1sumfoaf:mboxfoaf:homepagefoaf:icqChatIDfoaf:jabberID
Two people who share a common value for one of these properties are inferred to be the SAME person
foaf:msnChatIDfoaf:weblogfoaf:yahooChatIDfoaf:aimChatID
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Properties of FOAF Networks
Range from small to largeSome networks did not provide full member lists, so we had to crawl them
Network Purpose Members StudiedAvg. DegreeAdvogato Business 2,778.00 13.51Buzznet Photos 208,324.00 1.00DeadJournal Blogging 9,801.00 3.74eCademy Business 61,242.00 3.08FilmTrust Social/Entertainment 1,250.00 1.06GreatestJournal Blogging 36,862.00 33.36InsaneJournal Blogging 1,410.00 13.36LiveJournal Blogging 3,563,267.00 8.38Minilog Blogging 119.00 1.63Rossia Blogging 4,180.00 9.65Tribe Social/Entertainment 218,694.00 9.93
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Network Overlap
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Overall Results
All networks could be connected to at least 4 other networksOver 16,000 accounts could be mergedSmall overall percentage of users, but this is consistent with the fraction of hubs we expect in a network
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Conclusions for the Semantic Web
FOAF utilizes the logic of OWLReasoners can merge profiles of the same person maintained on different networksFOAF is an interesting realization of the Semantic Web goal of maintaining distributed knowledge that can be unified through reasoning.
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Potential Applications
Social Aggregating and Filtering Applications Recommender SystemsEmail FilteringAdvertisingNews SyndicationAll improved with semantics
Trust in Context
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Questions / Comments
Jennifer [email protected]
http://www.cs.umd.edu/~golbeckhttp://trust.mindswap.org