You can upload customer lists to AdWords, as well as Facebook for Remarketing campaigns.
In AdWords, you are not able to use the lists yet for Remarketing to the Display Network, but you can use it for Search Remarketing, Gmail, and Youtube Remarketing campaigns.
In addition, you can target lookalike audiences on Facebook ads as well as Youtube Video ads.
Here are links for more details:
https://support.google.com/google-ads/answer/6379332
https://www.facebook.com/business/help/170456843145568
