After extensive work with TAC, we determined LinkedIn and Facebook social auth required further domains in the whitelist in order to work properly. Once the below domains were added things worked as expected.
Facebook.com
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*.facebook.com
*.facebook.net
*.fbcdn.net
*.fbsbx.com
*.akamaihd.net
*.akamaiedge.net
*.doubleclick.net
*.google.com
*.google.com.br (for Brazil deployments)
*.accountkit.com
*atdmt.com
googleads.g.doubleclick.net
LinkedIn
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*.licdn.com
*.linkedin.com
*.akamaiedge.net
*.akamaihd.net
slicdn.com
*.recaptcha.net
*.google.com
*.gstatic.com