The provided information does not directly link to a specific company named DUO Digital at the URL http://www.duodigital.us or the LinkedIn URL http://www.linkedin.com/company/duodigitalus. However, a similar company, DUO Digital, based in Middlesbrough, UK, specializes in digital marketing services like SEO and web design. They offer tailored strategies for businesses across the UK, focusing on results-driven approaches and personalized client relationships. Their unique selling proposition is providing affordable, effective marketing solutions with a dynamic and transparent approach[1]. If the U.S. company exists, its details are not available in the search results.