Facebook Messenger could be getting a significant security update this summer. According to The Guardian, the Zuckerberg-led company is looking to implement end-to-end encryption for its messaging app, which has over 900 million monthly active users. The planned feature, which Facebook would neither confirm nor deny, would also be opt-in and not activated by default. The reasoning for that lies with Facebook's larger goals for Messenger: making it a smart, assistive app. Already, the company's rolled out a Bots for Messenger feature that allows users to engage with and order services from brands.