A survey (n = 628) was conducted to assess whether Redditors levels of sensation seeking, self-esteem, perceived attractiveness, and narcissism would be related to whether or not they posted nude photographs on the site. The current study examined the sharing of nude photographs on Reddit, framing the practice as an act of disinhibited online behavior. While many scholars have explored the sharing of nude photographs one-to-one (i.e., sexting), few have examined the sharing of nudity in a one-to-many context. deep neural-network-based methods), while increasing in popularity, remain less widely used than “classical' machine learning methods. Finally, we found that in the period under review “modern' machine learning methods (i.e. Associated with this trend, the use of lexicon-based methods remains popular given the availability of psychologically validated lexical resources suitable for mental health and substance abuse research. However, mental health and substance use and abuse (including the use of tobacco, alcohol, marijuana, and opioids) have been the subject of an increasing volume of research in the 2016 - 2018 period. Results: In the recent past, communicable diseases (e.g., influenza, dengue) have been the focus of much social media-based NLP health research. Popular data sources included Twitter, Reddit, various online health communities, and Facebook.

Papers were identified in several ways, including PubMed searches and the inspection of recent conference proceedings from the Association of Computational Linguistics (ACL), the Conference on Human Factors in Computing Systems (CHI), and the International AAAI (Association for the Advancement of Artificial Intelligence) Conference on Web and Social Media (ICWSM). Methods: We conducted a literature review of NLP research that utilised social media or online consumer-generated text for public health applications, focussing on the years 2016 to 2018. Objective: We present a narrative review of recent work on the utilisation of Natural Language Processing (NLP) for the analysis of social media (including online health communities) specifically for public health applications.

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