There are certain social media rules we can all agree on: Ghosting a conversation is impolite, and replying “k” to a text is the equivalent of a backhand slap (violent, wrong, and rude). But what about the rest of the rules? When can we really remind someone of our old Venmo request? What happens when someone tries to flirt with you on LinkedIn?

Fortunately, terminally online writers Delia Cai and Steffi Cao are here to answer all your digital quandaries, big or small. Welcome to Fast Company’s new advice column, Posting Playbook. This week, Steffi opines on what you should do when you don’t want to be tagged in the group photo.

How should I tell my friend I look bad in the group photo and want them to untag me?

So you’re looking through the group iCloud after a night out, where your Type A friend has uploaded all the photos. You swipe through and immediately cringe. Oh no! This was not the sultry, chic, carefree pictures you thought you took together. Your hair is messy, you’re not at your optimal photo-taking angle, your skin isn’t at its best, you can see your undereye circles, your cheeks are puffy from last night’s ramen, your smile looks kind of…weird. And then, Defcon 10: Someone posts that group photo on their........

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