Table 2.

Constructs and measurement items used in this study.

Variables	Measurement Items
Usefulness(UF)	(Davis, 1989; Moores, 2012; Cheng and Liu, 2017)
UF1	The use of paid social Q&A improves my work and life efficiency at the stage of coexistence with COVID-19.
UF2	The use of paid social Q&A makes me feel control over my work and life at the stage of coexistence with COVID-19.
UF3	The use of paid social Q&A makes it easier for me to understand, know and predict COVID-19, which saves my time.
UF4	The use of paid social Q&A makes it easier for me to improve my knowledge of COVID-19 health protection and relieve my psychological stress.
Easy of Use(EU)	(Davis, 1989; Moores, 2012)
EU1	I feel it is easy to use the paid social Q&A service system at the stage of coexistence with COVID-19.
EU2	I feel it is convenient to use the paid social Q&A service system at the stage of coexistence with COVID-19.
EU3	It is clear and easy for me to understand the interactive operation of the paid social Q&A service system at the stage of coexistence with COVID-19.
EU4	It is easy for me to remember how to use the paid social Q&A service system to ask questions or give answers at the stage of coexistence with COVID-19.
Professional(PF)	(Du and Xu, 2018)
PF1	The respondents of the paid social Q&A are professional at the stage of coexistence with COVID-19.
PF2	The respondents of the paid social Q&A are authoritative at the stage of coexistence with COVID-19.
PF3	The content created by the questioners and respondents of the paid social Q&A is professional in the aftermath of COVID-19.
PF4	The content created by the questioners and respondents of the paid social Q&A is authoritative in the aftermath of COVID-19.
Value(VL)	(Kim et al., 2012)
VL1	It is valuable for questioners to pay directly for questions rather than spending a lot of time looking for answers from free Q&A at the stage of coexistence with COVID-19.
VL2	It is valuable for questioners to pay directly for questions rather than spending a lot of efforts looking for answers from free Q&A at the stage of coexistence with COVID-19.
VL3	The questioner can get additional benefits by paid Q&A. I think it is valuable.
VL4	Through output of content, respondents can gain support and recognition from users, and gain corresponding benefits. I think it is valuable.
Emotional Contagion(EC)	(Davis, 1980b)
EC1	In the paid social Q&A, when I see warm and touching questions and answers (such as encouraging words) related to COVID-19, I will be touched.
EC2	In the paid social Q&A, when I see sad and melancholy content related to COVID-19, I almost always feel sympathy for the characters.
EC3	In the paid social Q&A, when I see someone's experience of being hurt under the influence of COVID-19, I feel sad and want to help them.
EC4	In the paid social Q&A, when I don't agree or like someone's questions or answers about COVID-19, I usually try to “put myself in his shoes” for a while.
EC5	In the paid social Q&A, I will try to imagine COVID-19 from the perspective of my netizens, so as to better understand my netizens.
Willingness to Pay(WTP)	(Zhang et al., 2019)
WTP1	When the answer's heterogeneous resources on paid social Q&A, I am willing to pay at the stage of coexistence with COVID-19.
WTP2	When more credible answers exist on paid social Q&A, I am willing to pay at the stage of coexistence with COVID-19.
WTP3	When the question I am interested in, or urgent or very important, appears on paid social Q&A, I am willing to pay at the stage of coexistence with COVID-19.
WTP4	When the price is affordable on paid social Q&A, I am willing to payat the stage of coexistence with COVID-19.
WTP5	When the expecting potential revenue exist on paid social Q&A, I am willing to pay at the stage of coexistence with COVID-19.
Panic Buying(PB)	Lins and Aquino (2020)
PB1	The panic about COVID-19 made me spend more on paid social Q&A.
PB2	One way to reduce the uncertainty is to ensure that there are enough paid social Q&A products I need on social Q&A platform at the stage of coexistence with COVID-19.
PB3	When I think that paid social Q&A may be time-limited, I will panic, so I will pay for a large number of social Q&A products at the stage of coexistence with COVID-19.
Digital Hoarding(DH)	(Neave et al., 2019)
DH1	If I delete certain files in my paid social Q&A platform favorites, I feel apprehensive about it afterwards at the stage of coexistence with COVID-19.
DH2	I resist having to delete certain files in my paid social Q&A platform favorites at the stage of coexistence with COVID-19.
DH3	Deleting certain files in my paid social Q&A platform favorites would be like losing part of myself at the stage of coexistence with COVID-19.