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Are you trying to download Facebook APK 3.9 ? You might be looking for this specific version if you have an older Android device (Android 2.2–2.3, Froyo/Gingerbread) or want a super lightweight version of Facebook that uses less data and battery.
Facebook APK version 3.9 is extremely outdated (from around 2012–2013). I have included a safety warning and context about why users might search for this (e.g., old phones, low bandwidth). Title: Facebook APK 3.9: Why You See This Old Version & How to Download Safely
Hashtags: #FacebookAPK #OldAndroid #FacebookLite #APKSafety
However, there are a few critical things you should know before hitting that download button.