Unfortunately, now this method will be flooded, and everyone of note in SV will be inundated with similar ads. But it is an interesting case study in how to be creative and think outside the box.

Facebook recently paid me a bounty for pointing out a problem that enabled this type of pinpoint targeting accuracy on their ad platform despite a policy that greatly limited it. It's interesting that LinkedIn doesn't consider it a privacy problem. I noticed that you could create custom audiences for ads by simply using anyone's FB vanity URL and appending @facebook.com to target by email. So if the vanity url of the target was facebook.com/mark, then you could target an ad to that person by simply adding mark@facebook.com to a custom audience list. They have now fixed it, but this same thing the author did here could have also been done on FB until about 2 months ago (and can still be done, but now you need their actual email address to target them).