Facebook isn’t being completely truthful about the data available in its “Download Your Information” feature. Some information is left out.
Privacy International recently tested the feature to download all ‘Ads and Business’ related information (You can accessed it by Clicking on Settings > Your Facebook Information > Download Your Information). This is meant to tell users which advertisers have been targeting them with ads and under which circumstances. We found that information provided is less than accurate. To put it simply, this tool is not what Facebook claims. The list of advertisers is incomplete and changes over time.
As Privacy International points out, this is in violation of GDPR because Facebook doesn’t let you see all of the advertisers that have your data.