When Facebook says it has over 800 million active users, it really seems to mean people who came into Facebook and used the service in some way in a given month. They seem to be logged in and somehow actively using their accounts.
As I understand it, Facebook counts anyone who clicks a like button on any website as being an active user for the month too.
It wouldn't shock me if, as non-Facebook user, if they counted my visit to a public event page as me becoming active too.
No , they don't. Facebook is pretty serious about that:
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Monthly Active Users (MAUs). We define a monthly active user as a registered Facebook user who logged in and visited Facebook through our website or a mobile device, or took an action to share content or activity with his or her Facebook friends or connections via a third-party website that is integrated with Facebook, in the last 30 days as of the date of measurement. MAUs are a measure of the size of our global active user community, which has grown substantially in the past several years.
" or took an action to share content or activity with his or her Facebook friends or connections via a third-party website that is integrated with Facebook"
Or making a comment on a web site that uses Facebook as their comment engine. That doesn't mean anything about whether they are visiting the Facebook site itself....
Not it isn't. If you visit https://www.facebook.com/media/video/ Facebook counts it. Google just hosts their videos on a different domain. It is still the same Google Account.
As I understand it, Facebook counts anyone who clicks a like button on any website as being an active user for the month too.
It wouldn't shock me if, as non-Facebook user, if they counted my visit to a public event page as me becoming active too.