This is the official timeline of Facebook's changes regarding Custom Audiences:
JULY 2, 2018
- Terms Acceptance and reminders - From July 2nd, after your first upload or creation of a new Custom Audience, you will have to accept the Terms and Conditions designed by Facebook for Custom Audiences. You'll get a reminder about the terms afterwards, every 90 days.
- Indication of Data Origin - From July 2nd, whenever you'll be creating a new Custom Audience, you will be required to indicate where the data comes from, either from Users directly (First Party Data), from Partners (Third Party Data) or from a mix of the two.
- Sharing Custom Audiences - In order to use Custom Audiences created by another user in a different Business Manager, you will need to establish a sharing relationship with the user. Be wary that these relationships will need to be confirmed both ways: user A will have to agree to share with user B, and user B with user A. IF you want to learn more, you can read Facebook's documentation here!
This last bit of information will then be made available to users when they click on "Why am I seeing this".
AUGUST 15, 2018
After this date, any previously shared Custom Audience that does not have a Business Manager relationship in place and was not shared through the new flow will no longer be available for use in new ad sets.
Campaigns set up before August 15 using Custom Audiences shared before July 2nd (including managed Custom Audiences) will continue to deliver until October 1, as long as those campaigns are not paused or edited after August 15.
October 1, 2018
Facebook will end delivery for shared Custom Audiences that do not have a Business Manager relationship in place. Delivery will only continue for campaigns using audiences that have been shared through established Business Manager partnerships.