E-commerce companies are the biggest ad-spenders across all media as brand building and customer acquisition are the top priorities for these companies. Flipkart and Amazon are leading the charge, with Snapdeal, Myntra and Jabong following suit. Even vertical e-commerce companies like Lenskart and Healthkart are burning top dollars in ad-spend. The trend is likely to continue till there are investors who are ready to bankroll the ad-spend or their cash run out.