Users of both Android and iPhone should stop using Facebook Messenger as their default messaging app, according to cybersecurity experts.

“Facebook Messenger users should realize that none of their chats between users are encrypted,” says Zak Doffman, a security and surveillance reporter at Forbes. This means that, unlike Facebook’s other messaging platform WhatsApp, Facebook can flag messages and content published on the platform.”

WhatsApp uses end-to-end encryption, which means that all conversation between two users is encrypted and can’t be read by anybody else, including Facebook. If you’re on Android or iOS, Doffman suggests using WhatsApp as your primary messaging app for personal conversations and Messenger for minor discussions.

Here’s what Doffman wrote, “Messenger users reading this should switch their personal chats to WhatsApp (or Signal) and leave Messenger for trivial comms and kids. You should certainly not be using it as the default messaging platform if you’re on Android, where switching from the OS default is an option-unlike on iOS.”

Read Doffman’s full article at Forbes.