#Google lies (2011): http://jackyan.com/blog/2011/05/google-ads-preferences-manager-issue-conrmed-by-nai/
#Facebook lies (2016): http://jackyan.com/blog/2016/02/your-preferences-mean-nothing-facebook-still-profiles-you-even-after-you-switch-off-interest-based-ads/ http://jackyan.com/blog/2016/12/facebooks-ad-targeting-evidence-now-filed-with-the-better-business-bureau/
It’s all about tracking you, regardless of whether you opt out or not.