The social networking site has reportedly launched a simplified version called "Facebook Lite" for low-end Android devices used by customers in emerging markets.
It is just 252 KB in size and can be used by those on 2G internet connections, Techcrunch reported.
The app is based on Snaptu, Facebook's feature phone client.
It includes some native Android features such as push notifications and camera integration to make the experience a more sophisticated one.
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The app has been launched in some countries in Asia and Africa, where it is being testing with a view to further expanding its features, the report added.
Nearly 10,000 people have downloaded the app so far, with a 4.6 rating from an initial 693 reviewers.
Download: Google Play Store