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To find out someone's birthday, go to their Facebook profile and click on the info box below their profile picture, which should display their date of birth. You can also try scrolling through their Facebook or Instagram until you find old birthday pictures or posts. If you think their birthday is today but you're not sure, go on Snapchat and look at their username to see if there's a cake emoji next to it. Also, check their Twitter posts to see if there's a balloon attached to them, which means it's their birthday. To learn how to find out someone's birthday without social media, scroll down!