Tell us how you've been affected by the Facebook data breach

Facebook is contacting users whose data it says may have been shared with Cambridge Analytica, with around 87 million people expected to receive a message in their newsfeed from Monday. The platform says the majority of users who could be affected – around 70 million – are in the US, but some will be in the UK. We would like to hear from people who see the message, and to find out more about how you think Facebook has handled the situation. Are you one of the 87 million users Facebook says it is contacting? Are you aware of any connections or settings that may have made your data vulnerable?