'External nofollow' in a robots meta tag? (advertorial links)
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I believe this has never worked? It'd be an easy way of preventing any penalties from Google's recent crackdown on paid links via advertorials.
When it's not possible to nofollow each external link individually, what are people doing? Nofollowing and/or noindexing the whole page?
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If you believe your site's ranking is being harmed by low-quality links you do not control, you can ask Google not to take them into account when assessing your site.
Use this tool...
https://www.google.com/webmasters/tools/disavow-links-main?pli=1
Hope that helps!