So you’ve gotten your COVID-19 vaccination. Congratulations, and thank you for nudging the planet closer to the herd immunity needed for life to return to normal! It’s a good idea to take a photo of your card as a backup before filing it with your other important papers, just in case. (If you lose the original, you may be able to get a new one from the site where you got the vaccine or through your state’s Immunization Information System.) However, we do want to offer a note of caution. Resist the urge to post that photo—or one of you gleefully brandishing your card—on social media. The cards include your name, date of birth, vaccine location, and other personal information that could be used to steal your identity, and any digital miscreant worth their salt is already trawling through your social media feeds for as much personal information as they can find.