Hi. I stumbled upon a new postcard book being released on December 21st. It is called “Postcards: The Rise and Fall of the World’s First Social Network” by Lydia Pyne.
Added by the Administrator: email the member for the link on Amazon.
Here’s a link to a review of Postcards in the 12/18/2021 issue of The Wall Street Journal (though it might not be accessible). A full half-page of the newspaper is dedicated to the review.