I emailed support and this is what they responded:
It's a riff on the Yo app, except instead of sending "Yo" in a push notification to a friend, you can send a postcard! It looks like this in real life: http://photos-b.ak.instagram.com/hphotos-ak-xpf1/10471825_52...
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[ 0.23 ms ] story [ 38.9 ms ] threadIf you want something that's actually worth using, a quick search reveals a few businesses such as http://www.postcardontherun.com/
<script>POSTCARD_PRICE = 149</script>
why?
https://postperfect.co
I emailed support and this is what they responded: It's a riff on the Yo app, except instead of sending "Yo" in a push notification to a friend, you can send a postcard! It looks like this in real life: http://photos-b.ak.instagram.com/hphotos-ak-xpf1/10471825_52...