“Click Here to Join”: A Large-Scale Analysis of Topics Discussed by Brazilian Public Groups on WhatsApp

Daniel Kansaon, P. Melo, Fabrício Benevenuto
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Abstract

WhatsApp has many similarities with online social networks, as it allows connections between multiple people and massive communication by sharing content with your contacts and public groups, which brings people together to discuss a topic. Even though it is one of the most popular social media in the world, there is a lack of a systematic understanding of the Whatsapp ecosystem, especially when it comes to knowing the subjects discussed in public groups and how other users find/join those groups. In this direction, our goal is to investigate how public groups are shared on the Web and also map the main topics existing within this ecosystem. For this, we perform a large-scale collection, spanning four main sources on the Web for sharing groups, with more than 270k WhatsApp public groups, categorizing and analyzing this environment. Our results shed light on a large existence of groups focused on topics such as friendship, pop culture, stickers, sales, jobs, education, and even adult content suggesting the many uses of the WhatsApp tool. We also found key differences in groups according to the source where it was posted. Moreover, we discovered how group links work to persuade users from other platforms into the underground environment of WhatsApp. Malicious groups abuse its closed architecture and low moderation for illicit practices such as selling fake money and cloned cards. Furthermore, our analysis also found evidence of automated behavior in malicious group sharing. Finally, we discuss implications and measures that can be taken to address these issues.
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“点击这里加入”:对WhatsApp上巴西公共团体讨论的话题进行大规模分析
WhatsApp与在线社交网络有很多相似之处,因为它允许多人之间建立联系,通过与你的联系人和公共群组分享内容来进行大规模通信,这将人们聚集在一起讨论一个话题。尽管它是世界上最受欢迎的社交媒体之一,但人们对Whatsapp的生态系统缺乏系统的了解,尤其是在了解公共群中讨论的主题以及其他用户如何找到/加入这些群时。在这个方向上,我们的目标是研究公共群组是如何在Web上共享的,并绘制出这个生态系统中存在的主要主题。为此,我们进行了大规模的收集,跨越网络上四个主要来源的共享组,超过27万个WhatsApp公共组,对这个环境进行分类和分析。我们的研究结果揭示了大量群组的存在,这些群组关注的主题包括友谊、流行文化、贴纸、销售、工作、教育,甚至成人内容,这表明WhatsApp工具的用途很多。我们还发现,根据发布消息的来源,不同群体之间存在关键差异。此外,我们还发现了群链接如何说服其他平台的用户进入WhatsApp的地下环境。恶意组织利用其封闭的结构和低节制进行非法活动,如出售假币和克隆卡。此外,我们的分析还发现了恶意群组共享中自动行为的证据。最后,我们讨论了解决这些问题的影响和措施。
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