We also have no idea how many more there are, certainly FB wasn't warning anyone that their numbers might have been incorrect because of bots any time before getting rid of them..?
From what I understand of the bot deletion in question, these were newer accounts and are not counted in the official monthly active user figures (the 2.2 billion number). That is, Facebook's monthly active count isn't going to suddenly show 1.7 billion now instead.
We also have no idea how many more there are, certainly FB wasn't warning anyone that their numbers might have been incorrect because of bots any time before getting rid of them..?