The problem with the "it's Teen Vogue's fault for fat fingering the publication" is that Sheryl Sandberg immediately shared the article on her personal Facebook page. I mean, are we to believe that she did not realize this was paid sponcon by her own company (PR/comms falls under her leadership) that it was "mistakenly" published and was organic content (in which case she should've known as well as they had access to FB employees with pictures inside the office).
Mistake or not, FB leadership clearly cheer led it's publication, and then walked back and claimed they had no idea this was sponsored, and only in the last hour or so said it was a "mistake" to deny it was sponsored.
Mistake or not, FB leadership clearly cheer led it's publication, and then walked back and claimed they had no idea this was sponsored, and only in the last hour or so said it was a "mistake" to deny it was sponsored.