There is currently no official "Facebook Lite" application in the Mac App Store. Meta has released a standard "Facebook" app for macOS, but it is essentially a wrapper for the mobile website and often consumes a surprising amount of system resources.
Search data suggests that when Mac users ask for "Facebook Lite," they are actually trying to solve three specific problems with the standard Facebook web interface: facebook lite for mac
Meta has never developed a native desktop operating system client (macOS, Windows, or Linux) for Facebook Lite. Several strategic and technical reasons explain this: There is currently no official "Facebook Lite" application