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The simplest and most reliable method is using the Facebook mobile website ( m.facebook.com ) inside Safari. While you won't get push notifications, it provides a stable, functional interface for scrolling the News Feed, liking posts, and sending messages. It requires no installation and bypasses the app's operating system requirements entirely.

: Many old app versions cannot connect to Facebook's current servers for security reasons (SSL/TLS certificate mismatches).

Open Safari, go to m.facebook.com . The mobile web version is surprisingly functional. Enable “Request Desktop Site” if needed. iOS 7.1.2’s Safari supports enough modern JavaScript to load the basic interface. You can also add it to your home screen as a web app.

To protect your personal data, avoid using your primary Facebook account on legacy devices. If you must use it, ensure you do not use the device to manage sensitive pages, financial data, or business accounts. If you need help setting up the tools, let me know: Which you are using (iPhone 4, iPad, etc.)? Whether your device is jailbroken or not? What error message you see if the app fails to load?

Before utilizing third-party sites, attempt the official workaround. Apple allows users to download the "last compatible version" of an app if it is already present in their purchase history. Step-by-Step Instructions:

iOS will display a prompt stating: "Download an older version of this app? The current version requires iOS XX or later, but you can download the last compatible version."

Have you already downloaded a of the Facebook IPA?

Method B: Installing via AppSync Unified (Jailbreak Required)