Summary by @tldr:

Steemit.com, the social media platform front-end for the Steem blockchain, was founded in the United States by Ned Scott and Dan Larimer (of Bitshares].
In his replies to comments on previous posts, Ricardo doesn't classify the billboard campaign as a replacement for online marketing, but rather sees it as a supplementary and supportive initiative.
People may not click on an online banner immediately, they could consider it is a scam or an internet gimmick, however if they saw it on a billboard previously, it gives it some "real world" validity.
(Data Source: Wikipedia) After seeing that many international travelling passengers; I would say that Steemit could get a ton of global attention in addition to domestic exposure.
(Information source) According to the Chicago Police Department, the disturbing rise in violence is driven by gangs and mostly contained to a handful of pockets on the city's South Side.
Terms and Conditions: Steem Dollar payout funds raised from this Steemit post shall be primarily allocated to the Chicago billboard campaign, and/or any other billboard site or @steemdrive public project where funds may be required in and paid in accordance with the general campaign terms and conditions.
Ned Scott of Steemit, Inc. approved the use of the domain steemit.life on artwork, which will point to a referral link for campaign tracking, otherwise not possible if steemit.com was advertised.