analysis of topological characteristics of huge online social networking services€¦ · ppt...
TRANSCRIPT
![Page 1: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/1.jpg)
Analysis of Topological Analysis of Topological Characteristics of Huge Characteristics of Huge
Online Social Networking Online Social Networking ServicesServices
Y.-Y. Ahn, S. Han, H. Kwak, S. Moon, H. JeongY.-Y. Ahn, S. Han, H. Kwak, S. Moon, H. JeongKAIST, Deajeon, South KoreaKAIST, Deajeon, South Korea
![Page 2: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/2.jpg)
High-Level Questions in the High-Level Questions in the PaperPaper
Are online networks similar to offline Are online networks similar to offline networks?networks? What are online networks’ characteristics?What are online networks’ characteristics? Is sampling representative?Is sampling representative? How do online networks evolve?How do online networks evolve?
You should all know what they found You should all know what they found out…out…
![Page 3: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/3.jpg)
1.1. Are these the right questions to ask?Are these the right questions to ask?
2.2. Is the evaluation sound?Is the evaluation sound?
3.3. Are the results surprising?Are the results surprising?
My High-Level QuestionsMy High-Level Questions
![Page 4: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/4.jpg)
Question #1:Question #1:Are these the right questions to Are these the right questions to
ask?ask?
![Page 5: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/5.jpg)
Why is it interestingWhy is it interesting
Map new phenomenonMap new phenomenon
One interesting study-case One interesting study-case
![Page 6: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/6.jpg)
Why is it non-trivial?Why is it non-trivial?
Or is it…? Or is it…?
Data accessibilityData accessibility
Sampling analysisSampling analysis
![Page 7: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/7.jpg)
Cyworld as a representative Cyworld as a representative online social network online social network
![Page 8: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/8.jpg)
Question #2:Question #2:Is the evaluation sound?Is the evaluation sound?
![Page 9: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/9.jpg)
number of triangles connected to vertex inumber of triples centered on vertex i
2 |{(v,w)|(i,v)(i,w)(v,w) Є E }|Ki (Ki -1)
Ci =
Ci =
(Newman ,SIAM Review 2003)
Aside 1: Calculating clustering Aside 1: Calculating clustering coeff. coeff.
![Page 10: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/10.jpg)
Aside 2: Snowball SamplingAside 2: Snowball Sampling Under-sample low degree nodesUnder-sample low degree nodes
Over-sample high degree nodesOver-sample high degree nodes
Underestimate power law Underestimate power law coefficientcoefficient
![Page 11: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/11.jpg)
Underestimating Underestimating αα
Estimated
K
P(K>k) = Fraction of
vertices with degree >=k
![Page 12: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/12.jpg)
EvaluationEvaluation Snowball sampling method evaluationSnowball sampling method evaluation
More quantitative analysis…More quantitative analysis…
-3.2
![Page 13: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/13.jpg)
Evaluation : Power lawEvaluation : Power law ““Clear power-law” :Clear power-law” :
![Page 14: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/14.jpg)
Historical AnalysisHistorical Analysis
http://www.internetworldstats.com
Internet hosts in Europehttp://gandalf.it/data/data2.htm
![Page 15: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/15.jpg)
Can the path length be Can the path length be calculated? calculated?
![Page 16: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/16.jpg)
Question #3:Question #3:Are the results surprising?Are the results surprising?
![Page 17: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/17.jpg)
Interesting findingsInteresting findings
Huge social networks are not ‘clean’. Huge social networks are not ‘clean’.
Different scaling (= user types?)Different scaling (= user types?)
Sampling – some rules of thumb for Sampling – some rules of thumb for rationsrations
![Page 18: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/18.jpg)
Assortative mixing pattern in Assortative mixing pattern in social networkssocial networks
Intuitive for race examples in SF, Intuitive for race examples in SF, 58’58’
Found to be true even for degree Found to be true even for degree correlation correlation
Is it? Is it? Online networksOnline networks Other networksOther networks
Implications?Implications?Cyworld paper:6-9/2006100k users of 33M0.3%
Flicker paper:10-11/2006 3M users out of 27M 11.3%
![Page 19: Analysis of Topological Characteristics of Huge Online Social Networking Services€¦ · PPT file · Web view · 2007-09-27Analysis of Topological Characteristics of Huge Online](https://reader036.vdocuments.net/reader036/viewer/2022062908/5ae127897f8b9a595d8b83fc/html5/thumbnails/19.jpg)
Questions for discussionQuestions for discussion Is SK the model representative? Is SK the model representative?
Do social networks really display assortative Do social networks really display assortative mixing w.r.t degree correlation? Implications mixing w.r.t degree correlation? Implications
How should we analyze networks with multiple How should we analyze networks with multiple user types? Implications? user types? Implications?
How do we use findings to leverage How do we use findings to leverage Security (degree of shared interest, reliability)Security (degree of shared interest, reliability) Robustness Robustness Recommendations (beyond friends?)Recommendations (beyond friends?)