Proskurnia, Julia Mavlyutov, Ruslan Castillo, Carlos Aberer, Karl Cudré-Mauroux, Philippe 2017 Automatically extracting information from social media is challenging given that social content is often noisy, ambiguous, and inconsistent. However, as many stories break on social channels first before being picked up by mainstream media, developing methods to better handle social content is of utmost importance. In this paper, we propose a robust and effective approach to automatically identify microposts related to a specific topic defined by a small sample of reference documents. Our framework extracts clusters of semantically similar microposts that overlap with the reference documents, by extracting combinations of key features that define those clusters through frequent pattern mining. This allows us to construct compact and interpretable representations of the topic, dramatically decreasing the computational burden compared to classical clustering and k-NN-based machine learning techniques and producing highly-competitive results even with small training sets (less than 1'000 training objects). Our method is efficient and scales gracefully with large sets of incoming microposts. We experimentally validate our approach on a large corpus of over 60M microposts, showing that it significantly outperforms state-of-the-art techniques. application/pdf https://folia.unifr.ch/global/documents/307759 https://folia.unifr.ch/documents/307759/files/cud_edf.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1145/3132847.3133016 info:eu-repo/semantics/openAccess License undefined CIKM '17: Proceedings of the 2017 ACM on Conference on Information and Knowledge Management. - 2017, p. 457–466 info:eu-repo/classification/udc/004 Efficient document filtering using vector space topic expansion and pattern-mining: the case of event detection in microposts http://purl.org/coar/resource_type/c_5794