About 2 decades ago (late 90s/early 00s), when I was still in high school, I opened up social media accounts online. Over the course of a few years and using these social media platforms, I posted personally-identifying information about myself online.
Today, an old friend contacted me to inform me that someone is stalking me and had used those ancient social media platforms to dig up real-world details about my self. Quite honestly, I find this absolutely mortifying.
I no longer have access to the social media accounts where I posted those things. I also no longer have access to the email boxes that I had tied to those accounts, and my old e-mail provider (yahoo) has 100% completely denied helping me with getting access to them.
I am an adult with a professional career in software engineering now. As I reviewed my old social media accounts, I have experienced extreme self-apprehension about my mid-teenage'ed self's online persona. The information that I posted as a kid was extremely ... well, it does not reflect well on me, nor do they reflect the world views I hold today.
I am much wiser now. I know that by posting PII online as a kid that I had unwittingly set myself up for this scenario. I didn't know better at the time, but one thing is for certain; it has to go. If this information is weaponized against me, it could be used to sink my career and relationships with people around me. And yet, I have no ability to clean up that old stuff, simply because I no longer have the account credentials required to do so.
Short of changing my name and moving across the world to take on a new identity, what can I do to prevent/mitigate the damage that a malicious third-party could do if they weaponize my info?