Here, a Harvard study: https://store.hbr.org/product/marketing-transformation-using-social-network-on-digital-media-how-bjp-used-whatsapp-to-create-a-successful

Here, a Harvard study: https://store.hbr.org/product/marketing-transformation-using-social-network-on-digital-media-how-bjp-used-whatsapp-to-create-a-successful-wom-campaign/IMB629 https://store.hbr.org/product/marketing-transformation-using...