Safari OS X: Fix Facebook web login buttons not working anymore

Here's a fix for Safari 8 on OS X Yosemite on how-to resolve the issues with the Facebook Single-Sign-On Login Buttons on websites not working anymore, due to a strict Cookie & website data restriction setting in Safari's Preferences.

Safari OS X: Fix Facebook web login buttons not working anymore – Swiss Mac User 

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Safari OS X: Fix Facebook web login buttons not working anymore – Swiss Mac User 

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