Participants assigned to this task were asked to search YouTube for a 5-10 minutes' video promoting mental help-seeking among college students. Then, they were expected to provide the link to the video and describe the content of the video. Next, participants were guided to form rebuttals disapproving three statements that rationalize students' low intention to seek mental help.

This task was to draft a Facebook message for the participants' fellow students. In their message, participants were expected to list three reasons for seeking mental help. The length of the message was not pre-determined.

Participants in this group were assigned a YouTube task advocating social distancing during a pandemic. The question prompts were modified from the tasks for the experimental groups.

Participants in this group were assigned a Facebook task advocating social distancing during a pandemic. The question prompts were modified from the tasks for the experimental groups.

Employing a longitudinal design, this study used a self-persuasion framework in a 4-arm intervention to increase college students' help-seeking intentions during the COVID-19 pandemic.

Help-Seeking Intention was measured by one item created based on recommendations by Ajzen (2002). Measured on a 5-point scale (1 = extremely unlikely, 5 = extremely likely), this item asked, "If you have a personal-emotional problem, how likely is it that you would seek help from a mental health professional (a psychologist, psychologist, or psychotherapist)?" Higher scores on this item suggest higher intentions to seek professional mental help.

Help-Seeking Behavior was measured by a validated item modified from previous research based on the transtheoretical model (Sarkin et al., 2001). The item asked about if a participant has sought mental help from a health care professional. Answers to this item included "1 = not intending to seek help in the next six months," "2 = intending to seek help in the next six months," "3 = planning to seek help in the next 30 days," "4 = have already sought help but for less than six months," and "5 = have been under treatment for more than six months."

participants rated 1 ("strongly disagree") to 5 ("strongly agree") on ten items of the Attitudes Toward Seeking Professional Psychological Help Scale-Short Form (ATSPPHS-SF) (Fischer & Farina, 1995).