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The Applicability of Authorship Verification to Swedish Discussion Forums

The authorship verification problem of determining whether two collections of textual content have been written by the same author or not is relevant in several contexts, e.g., when law enforcement officers try to find out whether a suspect with a known user account has other user accounts in the same or other web forums. In this paper, we evaluate how well the recently suggested attention-based hierarchical neural network approach AdHominem works and if it can be used to link user accounts on Swedish discussion forums. The results are encouraging and show that using AdHominem is a promising way forward when linking user accounts both on the same discussion forum and in cross-domain settings in which users write on a large variety of topics.