Finally, someone started taking my advice! This is very interesting. I never considered that homeowners might put up fake signs to detour the public.
"Special logo thanks! ---> We'll put your logo / icon (280 x 280 px) PLUS a link to your website on a special thank you page in the app! Plus, an advance copy of the app.
Estimated delivery: Jun 2013 "
Although note that they're only putting the link in the app, not on a website, from what I can tell. So, not really buying a link in the traditional sense.
"Special logo thanks! ---> We'll put your logo / icon (280 x 280 px) PLUS a link to your website on a special thank you page in the app! Plus, an advance copy of the app. Estimated delivery: Jun 2013 "
https://news.ycombinator.com/item?id=5794094