1. The Web of Data as a Complex System - First insight into its multi-scale network properties Christophe Guéret, Shenghui Wang , and Stefan Schlobach Department of Computer Science, Network Institute Vrije Universiteit Amsterdam

6. Since 2006, people are creating linked data

7. October 2007

8. July 2009

9. Evolution of the Web of Data

11. Amsterdam The Netherlands isLocatedIn Christophe VU Amsterdam workIn isLocatedIn workIn workIn The links have explicit semantics, which brings implicit links deduced after the reasoning process

14. Network analysis A new way of seeing the WoD What network analysis tells us

15. A new way of seeing the WoD Consider the WoD as network

20. The degree of 7 is critical point after which the network is not scale-free any more.

21. Top central nodes Betweenness centrality Closeness centrality Degree centrality Every centrality has a specific meaning... Node Value DBpedia 0.332 DBLP Berlin 0.108 DBLP (RKB) 0.100 DBLP Hannover 0.097 FOAF profiles 0.075 Node Value DBpedia 0.762 Geonames 0.614 Drug Bank 0.576 Linked MDB 0.544 Flickr wrappr 0.526 Node Value DBpedia 0.505 UniProt 0.266 DBLP (RKB) 0.266 ACM (RKB) 0.229 GeneID 0.211

25. Degree distribution BTC BTC aggregated Power-law distribution

26. Top central nodes:

27. The next steps Open challenges Ongoing research activities at VUA

30. “ sameAs” networks

32. {cgueret, swang, schlobac}@few.vu.nl We need to study more!