Yep. Personally I'd put stalking under questionable.
It's usually a creepy thing to do, but there might be cases where you just want to look out for someone's safety, so you follow them. Usually that's not a stalker's goal, but it varies. If the stalking results in an assault, robbery, or any other crime, that's certainly not okay! But the stalking itself was just questionable until that happened.
Note that if you follow someone online, which is a feature built into kbin, that's stalking. And there's really nothing wrong with it, unless you follow someone just to downvote all of their contributions.