Have you guys read about Facebook's Messenger Lite version? Facebook designed this version for older phones, those with low memory and really slow processors.
Mainly they are targeting emerging market that don't afford buying medium or high end smartphones. At first, the app will be available in Kenya, Malaysia, Sri Lanka and Venezuela but, probably they will not just stop here.
The app will be able tu run the basic functions such as messaging, sending and receiving photos, stickers and links. The developers haven't said if they will develop this app for iOS at the moment. They will optimize it for Android, as Android runs on less powerful phones.
They haven't decide it exactly what functions will be left out but we shouldn't be surprised if we don't see features as Stories or Chatbox available.
In order to recognize the app more easily, the designers kept the same icon only reversed the colors.
If they will release the iOS version i really consider installing it because it will save my phone's battery. I don't need all the feature that are available in the app. I can survive with Basic features just fine.