Research on social networks has exploded over the last decade. To a large extent, this has
been fueled by the spectacular growth of social media and online social networking sites …

Top-k nodes are the important actors for a subjectively determined topic in a social network.
To some extent, a topic is taken as a ranking criteria for identifying top-k nodes. Within a viral …

Content in microblogging systems such as Twitter is produced by tens to hundreds of
millions of users. This diversity is a notable strength, but also presents the challenge of …

We study personalized recommendation of social software items, including bookmarked
web-pages, blog entries, and communities. We focus on recommendations that are derived …

The study analyzes which forms opinion leadership takes in contemporary media
environments where communication channels have increased and started to permeate …

Community Question Answering (CQA) services enable their users to exchange knowledge
in the form of questions and answers. These communities thrive as a result of a small …

Email-based activity management systems promise to give users better tools for managing
increasing volumes of email, by organizing email according to a user's activities. Current …

The TREC Blog track aims to explore information seeking behaviour in the blogosphere, by
building reusable test collections for blog-related search tasks. Since, its advent in TREC …

We explore several different document representation models and two query expansion
models for the task of recommending blogs to a user in response to a query. Blog relevance …

In this article, we study the problem of finding experts in community question answering
(CQA). Most of the existing approaches attempt to find experts in CQA via link analysis. One …