  In this work, we describe some of the challenges Black-owned businesses face
in the United States, and specifically in the city of Pittsburgh. Taking into
account local dynamics and the communicated desires of Black-owned businesses
in the Pittsburgh region, we determine that university students represent an
under-utilized market for these businesses. We investigate the root causes for
this inefficiency and design and implement a platform, 412Connect
(https://www.412connect.org/), to increase online support for Pittsburgh
Black-owned businesses from students in the Pittsburgh university community.
  The site operates by coordinating interactions between student users and
participating businesses via targeted recommendations. For platform designers,
we describe the project from its conception, paying special attention to our
motivation and design choices. Our design choices are aided by two simple,
novel models for badge design and recommendation systems that may be of
theoretical interest. Along the way we highlight challenges and lessons from
coordinating a grassroots volunteer project working in conjunction with
community partners, and the opportunities and pitfalls of engaged scholarship.
