Score a FREE Beauty Sample of Olay Retinol24 Serum & Moisturizer! Be sure to check which newsfeed you want the ad to go on your Facebook account see the upper left side dropdown menu, then click the “Show Ad” button & you will be automatically forwarded to the newsfeed you selected. The sample offer should be one of the first posts in your feed. Next, click the ‘Sign Up’ button on the Facebook post & fill in the simple survey form and your details to get your FREE Olay samples! Olay Regenerist Retinol 24 Facial Serum penetrates deep into the skin’s surface layers to hydrate skin for 24 hours.