Facebook uses internal apps called Stormchaser and Night's Watch to squash criticism about itself.

Facebook uses internal apps called Stormchaser and Night's Watch to squash criticism about itself. Stormchaser lets Facebook employees track viral rumors and memes across its social network. From there it can displays messages debunking the false information in front of users who share the content. It was used to shut down the popular conspiracy theory that Facebook listens to users via mobile phone microphones. Night's Watch, after HBO's Game of Thrones, watches how news about Facebook spreads across WhatsApp. While WhatsApp messages are encrypted and therefore directly unreadable, Facebook can get a sense of what news is going viral on the messaging app by watching posts on Facebook that mention WhatsApp posts. Bloomberg