August 22nd, 2012 by Steven Shattuck Professional SEO and inbound marketing firm Slingshot SEO and Cicero-based innovative senior living developer Mainstreet Property Group have been named two of the country’s fastest growing private companies by Inc. magazine. Founded in 2006 by three friends from Zionsville, Slingshot SEO’s No. 136 rank was based on its three-year […]