Virginia Heffernan, author of the new book "Magic and Loss: The Internet as Art," talks with Recode's Peter Kafka about the physical things we risk losing as we digitize more and more of our lives. She praises Snapchat's "brilliance" for preserving impermanent media and talks about what happened when critics of an article about creationism threw her into the "Twitter coliseum." To cope with the social media onslaught, she came to imagine her Twitter handle, @page88, as a tougher, wittier persona who could take the abuse on her behalf.