When Facebook and real life collide

So I spent today in NJ hanging out with my grandmother. I'll probably post about what's going on at some point this weekend. But we had a lovely visit this AM, then my mom and I picked up my grandfather and met my sister and the Divine Ms M at Gus' Diner. After we ordered, my mom smiled and waved to someone. I turned around and it was one of my friends from Facebook, who I actually haven't talked to in real life in the last 15-20 years. But I know her sister is getting married, and what her results in all quizzes are. It was really strange!