Table 1.

The descriptions of the hypothesis variables.

Category and variables			Description
Content-related variables
	Readability	Readability can be calculated by the Flesch Reading-Ease formula
	Sentiment	Sentiment refers to, respectively indicate positive and negative emotions of the posts’ title and content
User-related variables
	Participation intensity	The user degree centrality in the Q&Aa relationship network
	Sociability breadth	The user degree centrality in the following relationship network
Context-related variables
	Topic diversity	The tag count of a question that user posts
	Topic intensity	The tag degree in the tag co-occurrence semantic network
Control variables
	Title length	Character length of a post’s title
	Content length	Character length of a post’s content
	Work time	Whether the user who asks the question is in working time

^aQ&A: question-and-answer.