While social media is increasingly leveraged to engage knowledge users in research priority-setting, there remains sparse explicit descriptions on how to implement it to build knowledge user-led research agendas. The aim of this study was to review a case study where social media was utilized to engage Canadians within the pediatric cancer community in a research priority-setting exercise; specifically highlighting the social media-based recruitment process, including recommendations on how to optimally engage key potential participants. A priority-setting partnership was launched to develop a stakeholder-driven research agenda in pediatric cancer in Canada. Social –media-based strategies were implemented for participant recruitment, developing a website, launching graphics and advertisements, and engaging internal and external stakeholders. These strategies incorporated the use of various social media platforms. We used descriptive statistics to analyze the data, in addition to the analytics provided by the platforms mentioned. Throughout the duration of the PSP, we garnered 870 Instagram followers, 450 Twitter followers, 69 Facebook page likes, 27 TikTok followers, 20 LinkedIn followers and 789 unique visitors to our website. Our Facebook page reached 28,641 people, while our Instagram profile reached 2,954 people. This social media campaign resulted in 330 individuals completing the initial survey of the PSP, and 197 individuals completing the interim prioritization survey. Social media is a novel approach to engage stakeholders in the development of a research agenda. Our study identified the following strategies as effective in increasing participation in our PSP: (1) creating a unified brand, (2) prioritizing accessibility (e.g., providing alternative text for all images), (3) ensuring social media campaign is reflective of the target audience by diversifying platforms and intermittently tailoring content to specific populations, (4) optimizing campaign’s reach via paid advertisements and circulating promotional material to partner organizations and individuals for them to subsequently share with their networks.