What is the name of Facebook's lightweight Android app?

The name of Facebook’s lightweight Android app is Facebook Lite.

Facebook Lite was designed for people using slower networks, limited data plans, or older Android phones. Its smaller installation size and reduced data demands made it especially useful in regions where fast mobile internet and newer devices were less common. The app retained core features such as News Feed, messaging, notifications, and photo sharing while using fewer system resources than the standard Facebook app.

The name can be confused with Facebook’s earlier “Lite” website. Facebook announced that browser-based service in 2009 for slower or intermittent connections, but discontinued it in 2010. Facebook later revived the concept as an Android app in 2015, reportedly with an initial size of less than 1 MB. Thus, “Facebook Lite” is the canonical answer; “Facebook Mini,” “Facebook Basic,” and “Facebook Go” were not the official names of this app.