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Mapping the Blogosphere in America CS406 Assignment - Group Presentation 1 Mapping the Blogosphere in America CS406 Assignment – Group Presentation Brian.

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Presentation on theme: "Mapping the Blogosphere in America CS406 Assignment - Group Presentation 1 Mapping the Blogosphere in America CS406 Assignment – Group Presentation Brian."— Presentation transcript:

1 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 1 Mapping the Blogosphere in America CS406 Assignment – Group Presentation Brian McGee Craig Murray Piers Thorogood Emlyn Whittick

2 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 2 Agenda Summary of the paper Papers key focuses –Geolocation of blogs –Indexing blogs to city units Related Work –Geolocation in general –Alternative mapping of the blogosphere Conclusion Questions

3 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 3 Summary of the Paper Mapping the Blogosphere in America Presented at the WWW2004 Workshop on the Weblogging Ecosystem: Aggregation, Analysis and Dynamics Dr. Alexander Halavais & Dr. Jia Lin University of Buffalo School of Informatics, NY

4 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 4 Summary of the Paper Initial phase of a long-term project Long- term goals: –Examination of American urban culture –Based on information found in personal blogs –Observe localised political agenda and opinion Short- term goals: –Extracting geographic information from blogs –Indexing blogs to city units

5 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 5 Geolocation of Blogs No single method to calculate the location of a blog... Self- hosted blogs (dedicated domain name): –Registrants address found in domain registry Hosted using blog- hosting service: –Location perhaps included in user-profile –Blog perhaps registered with regional blog-hosting service e.g. NYCblogger.com

6 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 6 Geolocation of Blogs What if there is no explicit location information? Answer: Data Mining... –Links to a CV or biography containing location information –Location found from links to local weather, school, church or other communities

7 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 7 Geolocation of Blogs Manual pilot run on 1500 US blogs –60% successful identification for self-hosted blogs –30% for blogs on blog-hosting sites Working on an automatic algorithm Current approach... 1.GeoURL Metadata, if available 2.Whois query for unrecognised domains 3.Profile information, if available 4.Blogchalking, if available 5.Text on index page (Bio / resume / regionalised links)

8 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 8 Indexing Blogs to City Units How do we standardise geolocation data? Varying levels of detail... –Self- hosted blog: Precise Street address 9- digit zip code –Blog-hosting site: Can be vague City, state, or even nation Local links can provide telephone area codes

9 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 9 Indexing Blogs to City Units How to convert this to a standard unit? Labelling of by city is vague –Expansion of city limits –Emergence of second cities between big cities Requirement for an urban unit –Geographic clusters consisting of certain sizes of population sharing physical proximity [1]

10 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 10 Indexing Blogs to City Units The 3- digit zip code –Widely used in marketing and political strategies –Represents 4 different types of area: Metropolitan city Cluster of suburban cities and towns Cluster of cities not immediately adjacent to a metropolitan area Metropolitan cities plus embedded cities and towns

11 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 11 Indexing Blogs to City Units Preliminary examination of blog distribution in the US –Users taken from Livejournal and Diaryland –Both services include location in user profile 797 different 3- digit zip codes found Overall distribution consistent with population distribution and concentrations of high socio- economic status

12 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 12 Indexing Blogs to City Units Figure 1. Distribution of blogs in sample [4]

13 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 13 Limitations of the Paper Authenticity of quoted geographic information is questionable 3- digit zip codes –Overstate the number of bloggers in metropolitan cities –Many small cities can be grouped into one unit, despite no evidence of common traits or social cohesion. –Paper suggests dividing units by socio-economic profile

14 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 14 Related Work Geolocation in general Non- Geographical Mapping of the Blogosphere: –Hyperlink Maps –Kohonen Self- Organising Maps

15 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 15 Geolocation Geographic Information Systems (GIS) –Geoparsing –Geocoding Methods –Whois records –Blogging sites requiring registration –Postal addresses and telephone numbers –Geographic feature names –Hyperlinks –Meta data

16 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 16 Geolocation Uses –Information retrieval based on geographic criteria –Tailoring of advertising –Sociological and political trends, mapping the buzz of a topic can see which areas are most interested in it Problems –Increasing number of mobile devices

17 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 17 Geolocation Trends –Blogging hotspots –More widespread blogging in Eastern US Figure 2. Blogging Hotspots [6]

18 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 18 Trends –Analysing blogs by geography shows where interest lies. –You can see a correlation between blogs and restaurant locations Geolocation Figure 3. Steak n Shake Restaurants [6]

19 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 19 Mapping Blogosphere Other methods of mapping the blogosphere: –Mapping hyperlinks –Self- organising maps –Mapping communities

20 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 20 Mapping Hyperlinks Figure 5. Outbound links [1] Figure 6. Inbound links [1] Cybermap showing outbound and inbound links from www.littlegreenfootballs.com in 3D hyperbolic space

21 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 21 Self- Organising Maps Neural Network like Kohonen SOMs can be used to map blogosphere Advantages –Performs clustering of input data –Maps this onto 2D surface for easy visualisation Figure 7. Kohonen Map of Blogs [7]

22 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 22 Mapping Communities Location, friendships and communities are all interrelated Figure 4. The importance of location interest and age in forming blogging communities [5]

23 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 23 Conclusion Summary of the Paper Geolocation –Methods –Uses –Trends Alternative Mapping Methods –Hyperlink Mapping –Self- Organising Maps

24 Mapping the Blogosphere in America CS406 Assignment - Group Presentation 24 References [1]R. Ackland, Mapping the U.S. Political Blogosphere: Are Conservative Bloggers More Prominent?, 2005. [2]O. Buyukokkten et al., Exploiting geographical location information of Webpages In Proceedings of WebDB-99, the 1999 ACM SIGMOD Workshop on the Weband Databases, 1999. [3] B. Gueye et al., Contraint-Based Geolocation of Internet Hosts, In Proceedings of IMC 04, Sicily, 2004. [4] A. Halavais and J. Lin, Mapping the Blogosphere in America, In Proceedings of the Thirteenth International World Wide Web Conference (WWW2004), New York, 2004. [5]R.Kumar et al., Structure and Evolution of Blogspace, In Communications of the ACM, 47:12 pp.35- 39, 2004. [6]L. Lloyd, P. Kaulgud, and S. Skiena, Newspapers vs. blogs: Who gets the scoop? In AAAI Spring Symposium on Computational Approaches to Analyzing Weblogs(AAAI- CAAW), California, 2006. [7]J. Merelo-Guervos et al., Mapping weblog communities, Depto. Arquitectura y Technologia de Computadores, Universidad de Granada, 2006.


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