User Behavior in Online Forums 1
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ECE697 Project
Deepak Unnikrishnan
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` Online forums
` Questions
` Data Collection and Analysis
` Results
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` Discussion sites in Internet
` Mostly user generated content
Question-Answers
Opinions
` Non-obvious relationships
between participants
` Limited information about users
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` Questions
Do people participating in online forums form
social bonds?
Is the interaction network similar to that observed in OSNs
(Facebook,Orkut, Blogs) ?
` Interestingly, online forums are not well-researched
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` User Grouping Behavior in Online Forums, Shi et al.,
KDD 2009 (UMich, Microsoft Research)
Focus on user joining behavior in forum communities
Information diffusion
Recommendation of communities to users
Limited discussion on network properties
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` Google Forums
http://www.google.com/support/forum/
HTML Content Easy to parse
Around 50 broad discussion topics
900,000 discussion threads
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` Account for 60% of total discussions
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` Top 5 discussed products
Gmail
Youtube Blogger
Adsense
Webmaster
~400,000 threads
~48,000 users
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` Crawl each product
` Represent interactions in a discussion category as
a directed graph
` Visualize using SocNetV[1], Gephi[2]
` Analyze data
[1]http://socnetv.sou
rcefo
rge.net/[2] http://gephi.org/
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` A starts a thread
` B, C reply to the thread
` A replies to thread
` Thickness -> Frequency of replies
` Similar to Blog networks[1]
A
B C
[1]Communication Dynamics of Blog Networks, Goldberg et al., KDD08
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Topic - Adding adsense to a site
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` Most users dont participate in related discussions
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Gmail Youtube Blogger Adsense
Indegree
Outdegree
Indegree Outdegree
Gmail 4.06 4.05
Youtube 4.7 3.8
Blogger 4.95 3.7
Adsense 4.8 3.4
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[1] Measurement and analysis of online social networks, Mislove et al. IMC07
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` 20%-40% overlap in top 10% of nodes
` Overlap similar to the web than OSNs
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` Users inclined towards contributing to discussions than initiating one.
` Scope for recommendation systems 3%-20% Unanswered posts
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` Less than 1% of the total links are reciprocal
` Higher reciprocity observed in larger forums
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` Fairly sparse network 7-14 times sparser than OSNs
[1] Communication dynamics of blog networks, Goldberg et al. KDD08
[2] The Small World Web, Adamic et al. ECDL99[3] Measurement and analysis of online social networks, Mislove et al. IMC07
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` Forums exhibit low density in network structure
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Path length Diameter
Gmail forum 2.4 14
Youtube forum 2.88 9.6Blogger forum 2.24 11.3
Adsense forum 2.10 10.14
Flickr 5 27
LiveJournal 6 20
Orkut 4 9
Youtube 5 21
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` Similarities exist with OSNs
Users exhibit weak social bonds in online forums
Degrees obey power law
` Sparse network structure with similarities to web andblog networks
` Scope for recommendation systems
Recommending topic experts based on posts
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