Most Helpful Guy
This is a great question and something many people do more than they care to admit.
Of the exes I have on FB, a couple are still my FB friends while a couple of them are not, and I haven't bothered to friend them and vise versa.
I'll actually find myself curious as to what's going on with both the ones in my friends network and the ones who are not; especially if the relationship was serious. Like you, I have no desire to reconcile anything, but am just interested in what they're now doing.
You're no psycho stalker, you're just a normal human being checking in on segments of your life that made you who you are today.