Unfollowback Girl

I had the experience recently of unfollowing someone on Twitter. He has about 800 followers, is following 400. A few days later, he unfollowed me. (I’ve had this experience several times in the past as well, which is why I checked.) My question is this: how did he know it was me? Barring him visiting my profile and noticing specifically, which is always a possibility, is there a tool you can use that alerts you who unfollows you? Or do people like that keep a list and crosscheck every time they lose a follow?

“Social Anxiety” is a new social media advice column by Anjali Mullany. The first installment dealt with whether someone can tell that you’ve been Facebook stalking them. (No, but the FBI can!) What else are we forgetting to worry about?