If you've spent any time on social media lately, you've probably noticed a trend where users are posting their then-and-now profile pictures, mostly from 10 years ago and this year. While this "10 Year Challenge" appears harmless, founder of KO Insights and the author of Tech Humanist , Kate O'Neill, says all this data " could be mined to train facial recognition algorithms on age progression and age recognition ." She adds: "It's worth considering the depth and breadth of the personal data we share without reservations." From the report:In closing, Kate says it's not necessarily bad that someone could use your Facebook photos to train a facial recognition algorithm -- it's inevitable. "Still, the broader takeaway here is that we need to approach our interactions with technology mindful of the data we generate and how it can be used at scale."