How to check and follow ICO* factsheets that can help you view and change your advertising settings on a range of social media platforms.
*"In March 2017 the ICO announced a broad investigation into the use of personal data and analytics by political campaigns, parties, social media companies and other commercial actors. We are currently investigating 30 organisations, including Facebook.
One part of this investigation is looking at how data was collected from a third party app on Facebook called “thisisyourdigitallife” and shared with an organisation called Cambridge Analytica. Facebook recently confirmed that information relating to up to 87 million people was captured by the app, with approximately 1 million of these people being UK citizens.
On Monday 9 April 2018 Facebook notified all those whose details were involved, via a message on their Facebook Newsfeed."
Source: Social media privacy settings