You’re in Boston, and you find a card bearing the URI. Would you follow said URI? I don’t think I would. But when I read about these cards at Universal Hub, I did follow the link. I found the request: If you come to this blog via a card you found in the city please email me or comment.
I think that the blog will get more hits from the link at Universal Hub than from the cards themselves. In other words, the cards will work better indirectly (via the hub) than directly. But I guess it depends on the cards…