stray
When I was in high school, about 20 years ago, one of my best friends killed himself. I kept in touch with his family for a while, but when I went off to college, I lost touch with them. I recently learned through a stray Facebook comment his sister left on a mutual friend’s page that his family still lives in my area.
stray Facebook commentとはどういうことでしょうか?よろしくお願いします