InstaWriter is a proposed networking and media sharing platform for writers and photographers. It aims to provide an alternative to blogging platforms by offering built-in SEO, grammar checking, and photo editing tools. The marketing plan outlines conducting promotions through social media, ads, and word of mouth to achieve 500,000 app downloads by June 2018. Revenue is expected to increase by attracting premium subscribers and collaborations with agencies. The implementation plan involves a phased approach to growth over 12-18 months.