Social Networking v585.0.0
Does Facebook work on iPhone Duo?
Yes. Facebook 585.0.0 is built with the iOS 27.1 SDK, so it can use iPhone Duo's whole inner display. We haven't seen Duo-specific features yet.
At a glance
- Inner display (7.6″)
- Full screen
- Outer display (5.4″)
- Works normally
- Built with
- iOS 27.1 SDK
- Version 585.0.0, read Oct 29, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v585.0.0
- Oct 28, 2026
- Duo in release notes
- Not yet
About Facebook
Facebook is made by Meta Platforms, Inc. and first came out on the App Store in February 2019. It's #23 on today's US App Store top charts. It has 29,042,477 ratings on the US App Store, averaging 4.5 stars. Version 585.0.0 came out on Oct 28, 2026 and needs iOS 15.1 or later. It's free to download. Among the 22 social apps we track on the US App Store, 11 already fill the inner display, 4 are partly adapted and 7 still show black bars. By number of ratings, Facebook is #2 of them.
From its App Store listing:
Where real people propel your curiosity. Whether you’re thrifting gear, showing reels to that group who gets it, or sharing laughs over fun images reimagined by AI, Facebook helps you make things happen like no other social network. Explore and expand your interests: * Shop Marketplace for hidden gems and take your hobbies to the next level * Personalize your Feed to see more of what you like, les…
On the inner display
The app reaches the edges of the inner display. Text and controls stay a comfortable size instead of being blown up.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including Facebook. Open it on the inner display, then add a second app next to it. You can save the pair and come back to it later.
Duo-specific features
None confirmed yet. Duo-specific features include side toolbars, layouts that react to the fold, and content on the outer display while the app is open inside.
Evidence & history
App build,
Version 585.0.0 is built with the iOS 27.1 SDK
Apps built with the iOS 27.1 SDK or later can use the whole inner display.
- : Not confirmed yet → Full screen — built with the iOS 27.1 SDK
Latest release notes
Version 585.0.0 · Oct 28, 2026
Our teams have solved many crashes, fixed issues you’ve reported and made the app faster.
Questions
Does Facebook work on iPhone Duo?
Yes. Facebook 585.0.0 is built with the iOS 27.1 SDK, so it can use iPhone Duo's whole inner display. We haven't seen Duo-specific features yet.
Does Facebook work on the outer display?
Yes. iPhone Duo's 5.4-inch outer display behaves like a regular iPhone screen, so every iPhone app works there as usual.
Can I use Facebook in Split View on iPhone Duo?
Yes. On iPhone Duo every app can be placed side by side with another app on the inner display — developers don't need to opt in. How comfortable it feels at half width depends on the app's layout.