What is social triggers for behavior change?

Social triggers for behavior change is a concept in personal epistemology: Other people can serve as triggers — asking someone to remind you is a social trigger.

Example: You want to run every morning but you've failed to do it alone for three months. You text a colleague: 'I'll be at the park trail at 6:30 AM. If I'm not there, call me.' The next morning your alarm goes off and you think about rolling over — but the image of your colleague standing at the trailhead waiting activates something no alarm could. You're out the door in four minutes. The trigger wasn't the alarm. It was the person.

This concept is part of Phase 22 (Trigger Design) in the How to Think curriculum, which builds the epistemic infrastructure for trigger design.