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CHAPTER 3

Semantic Analysis of Social Media Texts

3.1 INTRODUCTION

In this chapter, we discuss current NLP methods for social media applications that aim at extracting useful information from social media data. Examples of such applications are geolocation detection, opinion mining, emotion analysis, event and topic detection, summarization, machine translation, etc. We survey the current techniques, and we briefly define the evaluation measures used for each application, followed by examples of results.

Section 3.2 presents geo-location detection techniques. Section 3.3 discusses entity linking and disambiguation, a task that links detected entities to a database of known entities. Section 3.4 discusses the methods for opinion mining and sentiment analysis, including emotion and mood analysis. Section 3.5 presents event and topic detection. Section 3.6 highlights the various issues in automatic summarization in social media. Section 3.7 presents the adaptation of statistical machine translation for social media text. Section 3.8 summarizes this chapter.

3.2 GEO-LOCATION DETECTION

One of the important topics in semantic analysis in social media is the identification of geolocation information for social content such as blog posts or tweets. By geo-location we mean a real location in the world, such as a region, or a city, or a point described by longitude and latitude. Automatic detection of event location for individuals or group of individuals with common interests is important for marketing purposes, and also for detecting potential threats to public safety.