When Airbnb last week sent a note out about some modifications to its terms of service, few probably bothered to read through the reams of fine print to see precisely what had changed. But if you’re one of the 60 million-plus people who use the home-sharing service, you should probably pay attention, especially if you care about who Airbnb shares your data with, how deeply it peers into your personal history and what legal recourse you have if a gaggle of backpackers track mud all over your priceless Persian rug.