"By saying "visitors" i meant people who are not logged in.
About the "interests" section: Actually you don't need to complete it. For example when you like a musician's page it also appears in your…"
"Facebook ads are targeted to users not pages. So if you see an ad about something that's because the advertiser targeted people like you. In this case, you're seeing that ad because probably you have "data mining" in your…"