It’s hard to disappear these days. Everything from renting property and using a credit card to working a job leaves a digital footprint. But just because it’s hard to vanish from the virtual world doesn’t mean people aren’t trying. Some do it out of necessity, to escape violence or persecution. Others do it out of curiosity, pursuing total anonymity just to see how far they can take things. Marketplace’s Lily Jamali spoke with Hal Triedman, a privacy engineer who recently wrote about the “extreme privacy” community for the online magazine Reboot.