The #10YearChallenge was all fun and memes until last week after a tweet moved thousands of people to worry: are we unknowingly helping giant corporations to improve their algorithms for biometric identification and age progression?The #10YearChallenge gained widespread traction on social media this month. It calls for posting two photos of yourself side by side — one from today and one from a decade ago — to show how you’ve changed.Some made jokes, paid tribute to old hairstyles or drew attention to issues like global warming. Celebrities posted glamour shots that showed negligible changes.