4/20 Day — the celebration of marijuana that occurs every year on April 20 — gets more popular every year. And while you probably haven’t heard too much about it, your kids likely have. That’s because 4/20 awareness spreads mostly on the sites and apps that attract tweens and teens, such as Twitter, YouTube, Snapchat, Instagram, TikTok and other social media. Even mainstream companies including Wingstop, Lyft, Ben & Jerry’s, Denny’s and Burger King use the day to promote their brands not on TV or Facebook (where parents are), but on platforms with a younger following. If you’re looking for evidence of the virality of 4/20 Day, do a search on the name and associated hashtags in apps like Snapchat and Instagram, and check out the feeds of the social media influencers who use the moniker to elevate their personal brand.