Facebook use some quite sophisticated methods of tracking like Audio Context and HTML Canvas, and they reach a lot further than just their site. If you had logged into Facebook at some point on your Ubuntu phone, and you sent an email via a web based email service which had a Facebook tracker in they can link your activity. Simply blocking 3rd party cookies does nothing to stop them.
Heres a lengthy, paper on the topic: https://webtransparency.cs.princeton.edu/webcensus/index.html I've put a few other links from my site: http://quidsup.net/notrack/tracking.php Sorry I didn't mean to use this as a platform to hock a FOSS program, but I've really taken an interest in trying to prevent web trackers. Its a huge whack-a-mole game to find all sites dedicatated to tracking, so far I have a list of over 10,000 domains. Ivan
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