Advertisers can choose to exclude questions and audiences in all of their ad sets.
Questions can be excluded individually in its respective search bar. You can also use the “Bulk Exclude” button to find questions based on keywords or a Quora Session URL.
To exclude audiences in an ad set, create an audience in the Audiences tab or click "Create an audience" from the "Excluded audiences" dropdown menu. This feature can be used to exclude website visitors (Website Traffic Audience), a list of existing customers via email (List Match Audience), or other customized audiences.
If you are using Keyword Targeting, you can exclude keywords in the Choose Primary Targeting section of your ad set.