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A Close Look into Social Semantic Web

A Close Look into Social Semantic Web. --Presented by Juan Lin. Introduction. What is Social Semantic Web Social Semantic Web applications OntoWiki SMOB filmTrust – Review Websites Future Issues. The Social Web.

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A Close Look into Social Semantic Web

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  1. A Close Look into Social Semantic Web --Presented by Juan Lin

  2. Introduction • What is Social Semantic Web • Social Semantic Web applications • OntoWiki • SMOB • filmTrust – Review Websites • Future Issues

  3. The Social Web • Web 2.0 : web applications enables users to interact and collaborate with each other, providing power to end-users • Social Networking Sites • Facebook : about 750 million users • LinkedIn : around 150 million users • YouTube : content-sharing sites

  4. Current Issues with Social Web • Lack of interoperability • Lack of efficient data exchange • Reasons : • 1. individual service provider wants to bind their customers • 2. no common standards for all parties to exchange information

  5. When Social Web meets the Semantic Web • "The Semantic Web is not a separate Web but an extension of the current one, in which information is given well-defined meaning, better enabling computers and people to work in cooperation." -- Tim Berners-Lee (2001)

  6. FOAF • Friend of a Friend (FOAF), aiming at providing machine-readable contents that can be shared without the implementation of centralised databases • OWL and RDF are the foundation for FOAF • FOAF makes individual profiles from different social web pages into one fully detailed profile possible

  7. FOAF • foaf:name, foaf:surname and foaf:firstname are used to provide information for person name properties. • foaf:phone is used to describe phone number for individuals • foaf:nick is used to describe user preferred nickname for themselves • foaf:mbox can be used to provide Email address • foaf:depiction is for providing user profile image • foaf:homepage is the field for keeping the URL for person's personal home page • foaf:gender is for keeping gender information. • foaf:knows is a field that can be used to describe a person that current people object knows. It can be linked to another foaf:person instance.

  8. FOAF • Foaf:knows has different kinds of usage; • It can be used to describe two workers in the same company, but not closed friends • Allow linking individuals by using foaf:person, help generate RDF nodes to build up an integrated social network graph • FOAF description is saved into files and kept on the web servers, allowing public access to these personal profiles

  9. Semantic Wiki-- OntoWiki • Wiki -- a type of websites, allowing users to add, modify and delete the content via web browsers; e. g. Wikipedia • Current Usage for Wikis: free dictionaries, research projects/ papers

  10. OntoWiki • OntoWiki: help end users with simplification of the presentation and acquisition of web data • It uses “information maps” as the knowledge bases, where each node can be configured by end users and linked to other resources. • It provides different ways to view information for end users, e.g., list view, map view. • Assist social collaboration : changes tracking; commenting ; rating

  11. OntoWiki • It also contributes to the development of semantic search and it can be transformed to be a search engine • OntoWiki Mobile is available and following the HTML 5 standards, allowing users to edit and access semantic information on-the-run. • Issue with OntoWiki: it is based on knowledge engineering and it treats a single case as not known or not definable.

  12. Semantic Microblogging • Microblogging – a simpler form of blogging, such as Twitter, Sina Weibo • It is sensitive to real-time news and events • It contains a huge amount of data that provided by end users • Main drawback: posts are not related to any semantic; related posts are really hard to be integrated; hard to querying and reuse information; # hashtags are not machine-readable

  13. SMOB • SMOB – Semantic MicrOBlogging ; an open-source framework ; LAMP ; • Goal : provide a decentralised and distributed platform for microblogs • Each microblog published via SMOB is transformed into RDFa • It is built on distributed hubs, no need of centralised server. Distributed hubs communicate through SPARQL

  14. SMOB ontologies stack

  15. SMOB • “Interlinking components” is introduced to enable interlink microblog posts with the Linking Open Date cloud. • It can suggest relevant URI for each term in # hashtags automatically; can be used in the future • Auto-completion: for geography location information by integrating GeoNames ; allowing users gather related location-based information

  16. Review Websites • Review websites – online service websites for individuals to post/comment/rank particular products, services, etc. • Early review-enabled website: Amazon.com • FilmTrust : a web-based platform allows registered users to read, rate and review movies. The goal is to utilise trust rating within the Social Web as the foundation of calculating similaries.

  17. FilmTrust • Users can add other persons as friends, but can be one-way action. • Users rank their friends as “how likely you would see the film which is picked by this friend” • “Recommended Rating” uses the inferred trust values to compute with TidalTrust, to calculate a weighted average rating for each movie. • It is an example of collaborative filtering system

  18. Future Issues for the Social Semantic Web • Privacy on the usage of Social Semantic Web • Personal authentication and authorization issue How does individual authenticate themselves across a linked data web Related information disclosure access control is a necessity to protect individual’s privacy Data Collection Issue Semantic search might require record users’ activity history -- might violate users' privacy

  19. Future Issues cont. • Effective semantic search on the Semantic Web • Information overload • Lack of information availability ( required data not shown up to the querying users) • Navigation problem (feeling lost in hyperspace) • Ignorance of user diversity • How machine can understand the context of “terms”, e.g. different meanings for “Beetle”

  20. Conclusion • Social Semantic Web will be playing an important role in Web 3.0 • We need to carefully balance the pros and cons that Social Semantic Web brings up

  21. References • S.Auer, S. Dietzold and T. Riechaer , "OntoWiki- A Tool for Social Semantic Collaboration", 5th International Semantic Web Conference, ISWC2006, http://www.springerlink.com/content/e0081w7457683855/ • J.Banford, A. McDiarmid, and J. Irvine," FOAF: improving detected social network accuray", UbiComp (Adjunct Papers) 2010: 393-394. http://dl.acm.org/citation.cfm?id=1864453 • J. Golbeck and M. Rothstein, "Linking Social Networks on the Web with FOAF: A Semantic Web Case Study", AAAI Press, p. 1138-1143, 2008. https://www.aaai.org/Papers/AAAI/2008/AAAI08-180.pdf • J. Hendler and T. Berners-Lee, ―From the Semantic Web to social machines: A research challenge for AI on the World Wide Web", Artif. Intell., 174, (2), 156-161,2010. http://www.stanford.edu/class/cs227/Readings/hendler-berners-lee-semantic-web.pdf • A. Passant, T. Hastrup, U. Bojars and J. Breslin, "Microblogging: A Semantic and Distributed Approach", The 4th Workshop on Scripting for the Semantic Web (SFSW 2008) at the 5th European Semantic Web Conference (ESWC '08), Tenerife, Spain, 2008. http://aran.library.nuigalway.ie/xmlui/bitstream/handle/10379/539/11.pdf?sequence=1 • Sami I Makelainen, "Social Semantic Web", in Proc. ECOC’00, 2000, paper 11.3.4, p. 109. http://www.groundswell.fi/sim/academic/SocialSemanticWeb.pdf

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