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There is a great concern about the potential for people to leak privateinformation on OSNs, but few quantitative studies on this. This researchexplores the activity of sharing mobile numbers on OSNs, via public profilesand posts. We attempt to understand the characteristics and risks of mobilenumbers sharing behaviour on OSNs and focus on Indian mobile numbers. Wecollected 76,347 unique mobile numbers posted by 85905 users on Twitter andFacebook and analysed 2997 numbers, prefixed with +91. We observed, most usersshared their own mobile numbers to spread urgent information; and to marketproducts and escort business. Fewer female users shared mobile numbers on OSNs.Users utilized other OSN platforms and third party applications likeTwitterfeed, to post mobile numbers on multiple OSNs. In contrast to the user'sperception of numbers spreading quickly on OSN, we observed that except foremergency, most numbers did not diffuse deep. To assess risks associated withmobile numbers exposed on OSNs, we used numbers to gain sensitive informationabout their owners (e.g. name, Voter ID) by collating publicly available datafrom OSNs, Truecaller, OCEAN. On using the numbers on WhatApp, we obtained amyriad of sensitive details (relationship status, BBM pins) of the numberowner. We communicated the observed risks to the owners by calling. Few userswere surprised to know about the online presence of their number, while a fewothers intentionally posted it online for business purposes. We observed, 38.3%of users who were unaware of the online presence of their number have postedtheir number themselves on the social network. With these observations, wehighlight that there is a need to monitor leakage of mobile numbers via profileand public posts. To the best of our knowledge, this is the first exploratorystudy to critically investigate the exposure of Indian mobile numbers on OSNs.

Call Me MayBe: Understanding Nature and Risks of Sharing Mobile Numbers on Online Social Networks