I JUST found this site, & ran here to check it out with you. I did a quick web search & found nothing. It seems to work exactly in the same way that Postcrossing & Postcard United do, and at the same price: free. Other than that, the only thing I learned is that it’s a service of a site called “Global Penfriends.” I see that as of the time I captured this, an average of .5 cards are sent every hour.
Have you encountered this site? I remember I found almost no info on Postcard United before I finally decided to just dive in. The fact is that I probably don’t need any more postcarding sites, but–you know–I am curious. Let me know!