When you're close to someone you can make an initial exchange via QR+bluetooth. When you're distant you need to exchange your briar:// links on a different channel.
So if anyone wants to try the app but doesn't want to convince somebody else to do so too, just add my link and post yours below:
briar://acyeao3gd3sqldlljx6etcjyxdr4ux6m6s3ge3r4z6st7ju2ac5xg