@LeoKirke@retro.social BookMooch was a thing for a couple decades, and I swapped a good number of books through that system for many years. But, it seemed to decline over time, though the site still seems to be there. https://bookmooch.com (No copies of "Sand & Foam" available, though it recognizes the title. Almost all of the Khalil Gibran titles that were available seemed to be in Italian.) Not sure anything organized like that exists in the Fediverse, but your inquiry is perhaps the way to go.