Over the last decade, event prediction has drawn attention from both academic and industry
communities, resulting in a substantial volume of scientific papers published in a wide range …

As an emerging research area, event extraction from Twitter has attracted much attention
since 2010. This paper attempts to provide a critical survey of the technical achievements in …

Social unrest events are common happenings in modern society which need to be
proactively handled. An effective method is to continuously assess the risk of upcoming …

Continuously assessing the risk of upcoming social unrest events and predict the likelihood
of these events are of great importance. Thanks to the era of big data, people's …

Given a stream of Twitter messages about an event, we investigate the predictive power of
features generated from words and temporal expressions in the messages to estimate the …

Timely access to up-to-date, relevant and the geographically referenced emergency
information is considered as the essential requirement of the emergency response. The …

Microblogs such as Twitter represent a powerful source of information. Part of this
information can be aggregated beyond the level of individual posts. Some of this aggregated …

Civil unrest can trigger uptake of anonymous communication to protect user identity and
location or to circumvent censorship. Anonymity networks such as the Tor Network can …