Just read about this new discovery by Facebook.
Ok, no more sarcasm now. Let us think straight for this. What they have uncovered is that real-time streams between friends in private, when exposed to Facebook people internally, would know that you and your friend are actually connected to each other.
Also, advertisers would like this information.
Really folks, this was done quite a long time ago, albeit not at this scale and not by such a popular company.
Facebook presenting it publicly make it legit. Thank you.
Many including yours truely is waiting to make money of this.