&gt; The only reasonable explanation is that she found me on Facebook and viewed my profile. Facebook saved the incident and suggested her to me as a friend.<p>This. I had something similar happen a year or two ago; I enrolled in a course at a local university, and about midway through the semester Facebook suggested that I friend the instructor.<p>I was friends with no one else in the course, had never posted about the course on FB, or anything else that I could think of.<p>Of particular note was that his had all happened after I had to drop from the course due to health issues.