We participated in the MediaEval Benchmarking whose goal is to concentrate on the multimodal geo-location prediction on the Yahoo! Flickr Creative Commons 100M dataset the placing task. It challenges participants to develop models and/or techniques to estimate the geographic locations of the Flickr resources based on textual metadata, e.g. titles, descriptions and tags. We aim to find a procedu...

Twitter offers tremendous opportunities for people to engage with real-world events (e.g., political election) through information sharing and communicating about these events. However, little is understood about the factors that affect people’s Twitter engagement (e.g., posting) in such real-world events. This paper examines multiple predictive factors associated with four different perspectiv...

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This paper describes the results of our participation to the Synchronization of Multi-User Event Media Task at the MediaEval 2015 challenge. Using multiple similarity measures, we identify pairs of similar media from different galleries. We use a graph-based approach to temporally synchronize user galleries; subsequently we use time information, geolocation information and visual concept detect...

This article aims to raise awareness of a rapidly emerging privacy threat that we term cybercasing: using geo-tagged information available online to mount real-world attacks. While users typically realize that sharing locations has some implications for their privacy, we provide evidence that many (i) are unaware of the full scope of the threat they face when doing so, and (ii) often do not eve...

One-way delay (OWD) between end hosts has important implications for Internet applications, protocols, and measurement-based analyses. We describe a new approach for identifying OWDs via passive measurement of Network Time Protocol (NTP) traffic. NTP traffic offers the opportunity to measure OWDs accurately and continuously from hosts throughout the Internet. Based on detailed examination of NT...

Challenges for precise indoor geolocation cannot be overcome by using the existing RF models for multipath components (MPC). These models were designed for communication applications without specific attention to relation among the physical distance between the transmitter and the receiver and characteristics of MPCs pertinent to indoor geolocation applications. In this paper, we propose a nove...

The Regional Internet Registries (RIRs) publish information about all allocated IPv4 and IPv6 address blocks including country codes for each block. This information can be used for IP address geolocation. However, since large IP address blocks assigned to one country may belong to large international organisations spread over multiple countries the accuracy is questionable. With data from May ...

The advances in positioning technologies and the emergence of geolocation standards opens up to the development of innovative location-based services (LBS), e.g., web-based LBS. These services challenge existing privacy protection solutions. For example, the position information is provided by a third party, the location provider, and this party may be not fully trusted. In this paper, we analy...

Pervasive social systems often take advantage of geographical information to provide real-time information to users based on their location. However, due to privacy concerns, many social media users do not share their exact geographical coordinates. In this paper, we describe our technique that predicts locations of posts that are not associated with explicit coordinates, a process called geolo...