Not the person you responded to but a quick google returned this:

https://www.nbcnews.com/tech/social-media/facebook-investiga...

I do remember this case when it happened. It was pretty major news. It is not isolated either. Here is an example of google doing it.

https://www.businessinsider.com/google-engineer-stalked-teen...

Oh and here is another good one where the Executives were involved:

https://www.cbsnews.com/news/investigation-ebay-employees-st...

Seems like the other poster is right... this is par for the course