How do researchers recruit participants?
Recruitment is generally the first contact between researchers and prospective participants (whether through paper-based or online announcements, media communications, or face-to-face interactions) and is a prelude to the informed consent process.
How do I find interviewees for UX research?
Posting a Google Form on LinkedIn, Facebook, Twitter, or even Slack groups can be a good way to find research participants—just make sure you have a robust screener prepared to weed through unqualified candidates, since you'll likely get a lot of them.