trust in mobile social networks

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Trust in Mobile Social NetworksAlvin Chin

Senior Researcher

Nokia Xpress Internet Services China

alvin.chin@nokia.com

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The problem with online social networks

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Why should I link with you?Why should I add you?

Are you the person who I think you are?

Do I trust you?

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However, trust is an after thought

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Do you trust this guy to be your FB friend?

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So how can we trust people on OSN? What others say

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So how can we trust people on OSN? Explicit trust

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So how can we trust people on OSN? Implicit trust

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FilmTrust http://trust.mindswap.org/FilmTrust

A B CtAB tBC

tAC

Modelling trust, Jennifer Goldbeck, 2005

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• By their reputation• By their actions• By what others say about them

How do we trust people offline?

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Trust offline -> trust online

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How can we know this trust offline?

Mobile social networking!

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Mobile social networking: Making the mobile an integral part of your social network and lifestyle

distributed content sharing

social networks

sensor networks

pervasive computing

Provide integrated experience by fusing physical and digital social interactions through the mobile

Integrate context and social connections into mobile social networks

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Recording offline interactions

Xu et al, Using Physical Context in a Mobile Social Networking Application for Improving FriendRecommendations, In Proc. of PhoneCom 2011 workshop, 2011.

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Find who this person is and what you have in common

Chin et al, Using Proximity and Homophily to Connect Conference Attendees in a Mobile Social Network, In Workshop Proc. of ICDCS, PhoneCom 2012 workshop,

2012.

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Trust based on meeting in the past

Chin et al, Using Proximity and Homophily to Connect Conference Attendees in a Mobile Social Network, In Workshop Proc. of ICDCS, PhoneCom 2012 workshop,

2012. 15

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LeXiang prototype

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LeXiang prototype

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• Prob. of being friend is inversely proportional to the distance of their self-reported addresses in Facebook and with IP and geographical address (Backstrom 2010)

• L. Backstrom, E. Sun, and C. Marlow, "Find me if you can: improving geographical prediction with social and spatial proximity," in ACM WWW, 2010, pp. 61-70.

• Physical interactions such as Bluetooth encounter can be an indicator of friendship

• Eagle, N. and Pentland, A. Social serendipity: Mobilizing social software. IEEE Pervasive Computing, 4, 2 (2005), 28-34.

• Quercia, D. and Capra, L. FriendSensing: recommending friends using mobile phones. In Proc. ACM RecSys 2009, ACM Press (2009), 273-276.

• 100 times powerful influence from friends than from strangers (Hui 2009)

• Hui, P. Groupthink and Peer Pressure: Social Influence in Online Social Network Groups. ASONAM 2009, 53-59.

We trust our friends, and friends gather together

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Offline Improves Friend Recommendation

Xu et al. Using Physical Context in a Mobile Social Networking Application for Improving Friend Recommendations, 1st International Workshop on Sensing, Networking and Computing on Smartphones, In Proc. of CPSCom 2011, 2011

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Issues of trust in mobile social networks

• Accuracy of trust?• Measurement of trust (subjective rather than objective)

• Inferring trust from offline and online behaviour• Transfer of trust from offline to online and vice versa • Transitivity of trust, ie, if A trusts B and B trusts C, then should A trust C?

• Building trust in a social graph

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Alvin ChinXpress Internet Services ChinaNokia, Beijingalvin.chin@nokia.comhttp://www.alvinychin.com

Facebook: Alvin Chin (alvin.chin@utoronto.ca)LinkedIn: alvin.chin@nokia.comTwitter: gadgetman4uSina Weibo: http://weibo.com/2106762242 (gadgetman)Foursquare: Alvin Chin (alvin.chin@nokia.com)Google+: ubiquitousdude@gmail.com