I've never used a CB radio, but I thought I knew a thing or two about them. Then I learned about QSL cards. People used QSL cards to confirm that they'd talked with specific people over the CB radio. The Pie Shops, my favorite Flickr feed, has a wonderful collection of gorgeously-scanned QSL cards. Here are a few of my favorites from British Columbia.
The Internet Archive
YouTube: ephemeral ideas