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Towards real-time, country-level location classification of worldwide tweets

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Arkaitz Zubiaga, Alexander Voss, Rob Procter, Maria Liakata, Bo Wang, Adam Tsakalidis

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Abstract

The increase of interest in using social media as a source for research has motivated tackling the challenge of automatically geolocating tweets, given the lack of explicit location information in the majority of tweets. In contrast to much previous work that has focused on location classification of tweets restricted to a specific country, here we undertake the task in a broader context by classifying global tweets at the country level, which is so far unexplored in a real-time scenario. We analyze the extent to which a tweet's country of origin can be determined by making use of eight tweet-inherent features for classification. Furthermore, we use two datasets, collected a year apart from each other, to analyze the extent to which a model trained from historical tweets can still be leveraged for classification of new tweets. With classification experiments on all 217 countries in our datasets, as well as on the top 25 countries, we offer some insights into the best use of tweet-inherent features for an accurate country-level classification of tweets. We find that the use of a single feature, such as the use of tweet content alone-the most widely used feature in previous work-leaves much to be desired. Choosing an appropriate combination of both tweet content and metadata can actually lead to substantial improvements of between 20 and 50 percent. We observe that tweet content, the user's self-reported location and the user's real name, all of which are inherent in a tweet and available in a real-time scenario, are particularly useful to determine the country of origin. We also experiment on the applicability of a model trained on historical tweets to classify new tweets, finding that the choice of a particular combination of features whose utility does not fade over time can actually lead to comparable performance, avoiding the need to retrain. However, the difficulty of achieving accurate classification increases slightly for countries with multiple commonalities, especially for English and Spanish speaking countries.
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Original languageEnglish
Pages (from-to)2053-2066
Number of pages14
JournalIEEE Transactions on Knowledge and Data Engineering
Volume29
Issue number9
Early online date27 Apr 2017
DOIs
Publication statusPublished - Sep 2017

    Research areas

  • Twitter, Microblogging, Geolocation, Real-time, Classification

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