Modern financial markets are characterized by a rapid flow of information, a vast number of
participants having diversified investment horizons, and multiple feedback mechanisms …

In internet culture, lurkers are a special group of website users who regularly login to online
communities but seldom post. This study aims to provide an overall understanding of lurkers …

Persistence is an important characteristic of many complex systems in nature, related to how
long the system remains at a certain state before changing to a different one. The study of …

Recent research has highlighted limitations of studying complex systems with time-varying
topologies from the perspective of static, time-aggregated networks. Non-Markovian …

Sentiment analysis in social media is harder than in other types of text due to limitations
such as abbreviations, jargon, and references to existing content or concepts. Nevertheless …

When analyzing situations in which multiple people are experiencing emotions together—
whether the emotions are positive or negative and whether the situations are online or …

Bursty dynamics is a common temporal property of various complex systems in nature but it
also characterises the dynamics of human actions and interactions. At the …

Twitter and other microblogging services have become indispensable sources of information
in today's web. Understanding the main factors that make certain pieces of information …

We empirically analyze five online communities: Friendster, Livejournal, Facebook, Orkut,
and Myspace, to study how social networks decline. We define social resilience as the ability …

Sentiment analysis is a growing field of research, driven by both commercial applications
and academic interest. In this paper, we explore multiclass classification of diary-like blog …