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The Norwegian Consumer Protection Agency has just released an analysis of "dark patterns" used by Google, Facebook and Microsoft to trick users into giving up their privacy – in spite of #GDPR. You can download the 44 pages PDF here:
https://fil.forbrukerradet.no/wp-content/uploads/2018/06/2018-06-27-deceived-by-design-final.pdf
For a quick glance, check pages 40ff and see the "flow charts" of the menus dealing with "accepting" (or adjusting) the "privacy" settings. The first flowchart (FB) will certainly give you headaches …