For those who have been affected and have had their data harvested, there will be a message that lets them know and takes users to a Help Center page that gives users more information on how their data might have been misused. This rollout is expected to take place over time so if you don’t see it now, it does not mean that you weren’t affected.
However for those who weren’t affected, as you can see in the screenshot above, these users will soon be seeing notifications on top of their News Feed that lets them know about apps and websites that might have access to their data. It will also provide a link to a page where users can manage their apps and websites that use their data.
Previously Facebook had also announced that users who want to delete apps that are connected to their Facebook accounts can now do so in bulk. According to Facebook’s CEO Mark Zuckerberg who spoke about apps that misuse user data, “If we find developers that misused personally identifiable information, we will ban them and tell everyone affected by those apps.”