You will only see "Like," "Love," "Haha," "Wow," "Sad," and "Angry." The "Care" reaction (introduced later in 2022) will appear as plain text.
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For a brief period, Facebook allowed full "Chat Heads" within the main app without forcing you to install the standalone Messenger app. Version 4120005 retains this bridge. You can reply to messages without switching apps—a feature exclusively lost in updates released after this build. You will only see "Like," "Love," "Haha," "Wow,"
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In the standard semantic versioning used by Facebook (usually formatted as Version.Code), the number 4120005 indicates a specific build iteration. While this is not a widely recognized "famous" version number (like some legacy builds of Facebook Messenger or Instagram Lite), its specificity suggests a few possibilities:
In your keyword search, you used "for and exclusive." This likely refers to "for Android" (the operating system) and "exclusive" features. The Facebook 4120005 APK was the last generation of builds that treated Android as a first-class citizen, before the app became a uniform wrapper for a mobile website.