This is a promotion where you can get a free Clarins day cream sample by interacting with them on Facebook. Just follow their page, like some posts and engage with them. This should prompt them to show you an ad on your newsfeed. You'll then need to fill in your details (name, address, email) and claim the freebie. If it doesn't appear after a bit of effort, try adjusting your Facebook preferences, engaging more with their content and checking your feed regularly.