It's kinda like Instagram wouldn't you know.
The app's home screen displays a custom version of the standard Facebook feed but shows only photos and captions. It also lets users take pictures from within the app and also import them from the gallery to edit and upload.
The edits include typical Instagram style filters although a few features are missing from the app Facebook paid a billion for.
Needless to say these pics go on Facebook with all the usual personalisation options around tagging and so on.
But for all the Instagram-ness, it seems the app was built without help from Instagram, and was actually the work of a team comprising developers recruited from Gowalla and MadeBySofa. That's what the Verge alleges.
It all adds to the drama of the last few weeks in which first Instagram was bought for an obscene amount, then Facebook IPOd with insane success before a dramatic collapse, and then regulators circled on the firm not least after finding out that Mark Zuckerberg had negotiated with Instagram without the full knowledge of his board.