Yes, it seems like that, and thats what I am trying to say, that browsers are just one vector, users information is collected from number of sources: - apps you

Yes, it seems like that, and thats what I am trying to say, that browsers are just one vector, users information is collected from number of sources: - apps you use on your mobile - your email/phone (example: which you gave to a Pizza company is same as of your fb) - Your address which is with a local store nearby etc. etc. All this information is collected to connect all the dots. When I was going through the advertiser list, I was kinda shocked coz I never give my any detail to them, and still they have somehow uploaded it to fb. FB should ask the advertisers about source of data.