Over the last few years, online social networks (OSNs), such as Facebook, Twitter and
Tuenti, have experienced exponential growth in both profile registrations and social …

Online social networks (OSN) are a permanent presence in today's personal and
professional lives of a huge segment of the population, with direct consequences to offline …

Users increasingly rely on the trustworthiness of the information exposed on Online Social
Networks (OSNs). In addition, OSN providers base their business models on the …

In many Twitter applications, developers collect only a limited sample of tweets and a local
portion of the Twitter network. Given such Twitter applications with limited data, how can we …

Users increasingly rely on crowdsourced information, such as reviews on Yelp and Amazon,
and liked posts and ads on Facebook. This has led to a market for blackhat promotion …

Sybil accounts are fake identities created to unfairly increase the power or resources of a
single malicious user. Researchers have long known about the existence of Sybil accounts …

Fake identities and Sybil accounts are pervasive in today's online communities. They are
responsible for a growing number of threats, including fake product reviews, malware and …

Recently, there has been much excitement in the research community over using social
networks to mitigate multiple identity, or Sybil, attacks. A number of schemes have been …

As popular tools for spreading spam and malware, Sybils (or fake accounts) pose a serious
threat to online communities such as Online Social Networks (OSNs). Today, sophisticated …

Popular online social networks (OSNs) like Facebook and Twitter are changing the way
users communicate and interact with the Internet. A deep understanding of user interactions …