Event detection and tracking using social media and user-generated content has received a lot of attention from the research community in recent years, since such sources can purportedly provide up-to-date information about events as they evolve, e.g. earthquakes. Concisely reporting (summarising) events for users/emergency services using information obtained from social media sources like Twitter is not a solved problem. Current systems either directly apply, or build upon, classical summarisation approaches previously shown to be effective within the newswire domain. However, to-date, research into how well these approaches generalise from the newswire to the microblog domain is limited. Hence, in this paper, we compare the performance of eleven summarisation approaches using four microblog summarisation datasets, with the aim of determining which are the most effective and therefore should be used as baselines in future research. Our results indicate that the SumBasic algorithm and Centroid-based summarisation with redundancy reduction are the most effective approaches, across the four datasets and five automatic summarisation evaluation measures tested.
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