Yes, twice.
As far as I know, one of them (an ex) is just biding his time and will show himself again. At this point, I don't think he's dangerous, just very obsessed. I don't feel like I'm ever very hidden from him, because he knows who my family and friends are, and that's how he managed to find me last time. My social media is private, but he kept hitting up friends of friends, searching, until someone led him to me. But even if I deleted everything, I doubt I'd be safe. He's shown up on my doorstep in the middle of the night, when I was visiting someone in a town I don't live in before. How??? I'll never know.
The other was a true psycho, a neighbor who would follow me around for years. Among many other things, they would hide wearing camo taking pictures of me going to work and kill animals and leave them hanging where I'd see them, like threats. There were guns. I was constantly terrified I'd come home to find everyone in my house murdered one day. One reason I moved across the country was to try to be safe from that situation. It was awful. Despite all the evidence and harassment, I couldn't even get a restraining order against them. I think it's over as long as I'm here, but I don't dare go back there. Part of my PTSD stems from that. I hate that they have that much hold on me still.