Accounts are replacing People in your Facebook Ads Manager.
You might have started seeing the "Cost Per 1,000 Accounts Center Accounts Reached" metric. This isn't new. It merely replaces Cost Per 1,000 People Reached.
You'll see this elsewhere, as well. The Reach metric is no focused on the number of Accounts Center Accounts reached, not people. And Frequency is related to... well, you get it. Accounts Center Accounts.
Nothing is actually changing with any of these metrics. It's merely a rewording to clarify the metric.
Users can link their Facebook and Instagram accounts within the Accounts Center. So, if you reach a person on both Facebook AND Instagram, you have still only reached one Accounts Center Account.
And technically, it was still one person, too. That's why the calculation hasn't changed.
Keep in mind that these accounts have to be linked within Accounts Center. If a person keeps them separate and you reach them on both Facebook and Instagram, it will be counted as reaching two different Accounts Center Accounts.
