What is happening around the world? When and where? Mining the geo-tagged Twitter
stream makes it possible to answer the above questions in real-time. Although a single tweet …

The location of the author of a social media message is not invariably the same as the
location that the author writes about in the message. In applications that mine these …

The remarkable success of online social media sites marks a shift in the way people connect
and share information. Much of this information now contains some form of geographical …

This paper presents Mercury; a system for real-time support of top-k spatio-temporal queries
on microblogs, where users are able to browse recent microblogs near their locations. With …

With the rising growth of the telecommunication industry, the customer churn problem has
grown in significance as well. One of the most critical challenges in the data and voice …

With the inception of the Twitter microblogging platform in 2006, a myriad of research efforts
have emerged studying different aspects of the Twittersphere. Each study exploits its own …

Data stream profiling concerns the automatic extraction of metadata from a data stream,
without having the possibility to store it. Among the metadata of interest, functional …

Analysts wish to explore different hypotheses, organize their thoughts into visual narratives
and present their findings. Some developers have used algorithms to ascertain key events …

Computer Vision and Image Processing are emerging research paradigms. The increasing
popularity of social media, micro-blogging services and ubiquitous availability of high …

Social networks have become a source of data which are of interest in all areas, and their
querying and analysis is a hot topic in computer science. Our research group has developed …