You might think your tweets on Twitter belong to you. But in 2010, the Library of Congress acquired the entire archive of Twitter. Why would such a majestic library acquire such seemingly ephemeral material? Historian Abby Smith Rumsey, author of When We Are No More, talks with EconTalk host Russ Roberts about this decision of the Library of Congress and the general challenge of how to cope with a world when so much of what we write and read is digital. Subjects discussed include what we can learn from the past, the power of collective memory, what is worth saving, and how we might archive our electronic lives so that we and those who come after us can find what we might be looking for.