Table 1.

Keywords for literature search.

Category	Keywords
Mental illness (1)	Mental disorder, mental health, mental illness
	Depression, suicide, psychology, insomnia, stress, anxiety, schizophrenia, phobias, PTSD (post-traumatic stress disorder), ASD (autism spectrum disorder), anorexia, bipolar
Data sources (2)	Social media, text, language, posts, notes, interviews, records, survey
	Twitter, reddit, weibo, microblog, facebook, instagram
Methods (3)	Natural language processing, deep learning, machine learning, text mining, text analysis
	Neural network, CNN, LSTM, SVM, tree
Detection (4)	Detect, identify, recognize, predict, prevent, screen, assess, understand
Search query	(1) AND (2) AND (3) AND (4)