Instagram and Twitter users can score a FREE Pack ofRainbow OREO Cookies! Here’s how: Simply follow these directions (there are 3 posts)on Oreo’s official Twitter page. You’ll need to post a picture on Instagram or on their Twitter utilizing the hashtag #ProudParent AND #Giveaway and also tag @OREO to be eligible. You might delete your picture at any time. These will go fast, so hurry!