Facebook is arguably the greatest tool ever created for connecting and reconnecting with the people who pass through your life. But some of them, often interesting and sometimes attractive, were friended at a bar at 2 a.m. and then forgotten by the time you woke up. Yet now that person is casually in your life again a decade later via some recipe they posted that jumped into your newsfeed. You should definitely look at their wall for a minute, glance at their recent pictures, remember where and how you met them, and even message them if you want to say hey and catch up. But there’s a fine line between reminiscing about the good old days and wondering whether that significant other is still around.