[xexers]

Is there a rock solid proof that shadow profiles exist? I only ever seen anecdotal evidence... and Zuck said he's not aware of them.

The wikipedia page doesnt have much:

https://en.wikipedia.org/wiki/Facebook#Shadow_profiles

[femto]

Mark Zuckerberg said yes, but he doesn't call the data a shadow profile [1].

With apologies to Shakespear:

"What's in a name? That which we call a shadow profile By any other word would smell as repugnant;"

[1] https://www.usatoday.com/story/tech/columnist/baig/2018/04/1...