3 ms·
It's worth noting that according to this study[1], Facebook has trackers on 25% of the top 1 million websites (Google is top with 75%). This doesn't immediately
by tagawa 9y ago
It's worth noting that according to this study[1], Facebook has trackers on 25% of the top 1 million websites (Google is top with 75%). This doesn't immediately explain how they get around the use of separate browsers, but with device fingerprinting techniques, e.g. checking the list of installed fonts, screen size, IP address, etc., I'm sure they can reach a high probability of recognising a single user.
[1] https://webtransparency.cs.princeton.edu/webcensus/ https://webtransparency.cs.princeton.edu/webcensus/
- kristianc 9y agoFacebook's trackers (predominantly) link back deterministically to a logged in Facebook account. Your account on Facebook is linked to a list of known devices/browsers that you use (verifiable as when you try to log in to a device or browser that you don't use regularly, Facebook will prompt you). Facebook and Google will make use of probabilistic device fingerprinting techniques etc, but to nowhere near the same extent that a company would that didn't have FB/Google's level of logged in data.