By the way, I'll participate in @joseph's contest (
https://steemit.com/steemfest/@joseph/win-a-free-trip-to-lisbon-portugal-to-attend-steemfest-ii) with the billboard idea in my country plus my genaral Steemit vision. Will give you credits as the first one who has launched it.
Let me summarize what happened today: the outdoor advertising agency is ready to send me a quote as soon as I confirm I'm. Their sizes are 4 x 3 meters and the location I've chosen is a young student's neighborhood. People there are mostly crazy about Facebook and Instagram, but we'll see if this is slightly changing when the billboard is installed.