Data Science in Social MediaData Science in Social Media

Naveen Kumar Sridhar

AgendaAgenda

Data ReliabilityTrustRelation between Reliability and TrustOntologiesSPARQLFuture work

MotivationMotivation

One of my friends posted a status message on Facebook,

No classes today. Thank you Irene.

First question that came to my mind,

Is this person reliable?

Data ReliabilityData Reliability

Definition:Reliable data is evidence you can trust.

Example:If two people are doing the experiment and the result is almost same most of the time, then we consider the data to be reliable.

In social network like Facebook, data can be classified as reliable data based on the trust on a person who posts the data.

EvidenceEvidence

Definition‘Evidence’ is data which is judged to be relevant.

Example:When you investigate cooling, temperature data is relevant, so it is evidence. The length of the thermometer is not relevant, so it is not evidence.

TrustTrust

Definition:Trust in a person is a commitment to an action based on a belief that the future actions of that person will lead to good outcome. (Golbeck and Hendler)Example:A believes in B expecting that B provides certain information which are correct to the context.

Trust TypesTrust Types

Direct Trust

Relational Trust

System Trust

Direct TrustDirect Trust

Scenarios:You know a mechanic who has already repaired your car. You know a friend who lives in Chennai. He posts a status message

Weather is pretty cool

Do not forget that trust is contextual

Relational TrustRelational Trust

ScenariosYou are new to Troy. You have to buy some apples. Your friend says

‘Price Chopper is the right place’ Your friend likes a status message of his friend in Facebook

‘There is a DJ tonite @ Brown’s’

System TrustSystem Trust

ScenariosYou are going to a small town which has a small grocery store. They have only nameless toothpaste. You can see a FDA approval over the label.You see a message posted by some person you don’t know. You can see that he is from RPI or Stanford.

Facebook DataFacebook Data

OntologyOntology

DefinitionAn ontology is an explicit specification of a conceptualizationTools:Protégé 4.2.0Link:https://dl-web.dropbox.com/get/Independent%20Study/OntologyTrustFacebook.owl?w=3db9b219

SPARQLSPARQL

SPARQL stands for SPARQL Protocol and RDF Query Language.

Used SPARQL to query the data obtained from Facebook which was in the RDF form.

This can be integrated later with the ontology so that we can infer trust values directly.

Ontology ExplanationOntology Explanation

Trustor is someone who must choose whether, and how much, to trust.

Trustee is someone or something that is to be trustedThe ontology is designed to find the different forms

of trusted Trustees.

Ontology ExplanationOntology Explanation

Trustee class is divided into five sub-classes

Completely TrustedSomewhat TrustedSomewhat UntrustedCompletely UntrustedDon’t know

Ontology ExplanationOntology Explanation

Trust classes areAssociation – To find out whether there is an association between trustor and trusteePriorKnowledge – To find out whether the trustee has prior knowledgeMetadata Source – To find out whether Trustee has valid IP addressSourceOfData – To find out whether trustee has mentioned the links of the source

Ontology ExplanationOntology ExplanationCompletely Trusted – Trustee is a professor/has a

professional relationship and has provided the source link of data and has prior knowledge.

Somewhat Trusted – Trustee is a professor/ has a professional relationship/has provided the source and also has prior knowledge

Somewhat Untrusted – Trustee is not having any one these:priorknowledge/link/association

Ontology ExplanationOntology ExplanationCompletely Untrusted – Trustee has no trust factors

associated with himDon’t know – If the trustee does not fall in any of the

four categories mentioned above categories.

SPARQL End PointSPARQL End PointSample RDF is placed in an existing triple storeAs data is sensitive, I pulled data for one person(any

amount of data is possible)Data in Facebook which I can see when I am online,

is pulled from graph API in RDF format.

Link : http://bit.ly/t67iav

Future WorkFuture WorkOntology will be used to infer trust of the data from

Facebook(complete model)PML Trust Ontology can be created for Social

Networks.

ReferencesReferences

http://www.ci.austin.tx.us/auditor/downloads/testing.pdfhttp://dig.csail.mit.edu/2011/Papers/ruleml/paper.pdfhttp://www.cs.helsinki.fi/group/cinco/publications/pdfs/viljanen05towards.pdfhttp://www.ai.sri.com/daml/services/owl-s/security/context/ToiDen04.pdf http://www.cs.st-andrews.ac.uk/~tristan/pubs/sn2011.pdfhttp://www.cypherpunks.ca/~iang/pubs/tep.pdfhttp://www.justice.gov/ag/annualreports/pr2009/sect1/data.pdfhttp://www.justice.gov/ag/annualreports/pr2009/sect1/data.pdfhttp://www-ksl.stanford.edu/kst/what-is-an-ontology.htmlhttp://owl.cs.manchester.ac.uk/tutorials/protegeowltutorial/resources/ProtegeOWLTutorialP4_v1_3.pdf

ReferencesReferences

http://www.seco.tkk.fi/publications/2011/laurenne-et-al-envirofi-2011.pdfhttp://www.hipertext.net/english/pag1031.htm http://www.iti.illinois.edu/sites/www.iti.illinois.edu/files/docs/profile-files/trust-icec06.pdfhttp://www-ksl.stanford.edu/kst/what-is-an-ontology.html