@Ledswinger Re: Dual accounts?
i pulled a contract at FB a few years ago.
I was forced to create a FB account.
When I left, I 'deleted' the account, but in doing so, FB said that they will keep the account around just in case... So while dormant, its still 'active'.
Then there are accounts like the one I use here. Pseudonyms that have never been associated to a FB account.
But what happens when you visit a site that runs FB javascript code? And it captures data which is now tracking said pseudonym. Is that not an 'active user'?