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How would you go about designing a social news feed for an iOS app that's on par with the likes of Twitter and other popular platforms?

How would you scale up a social photo browsing app with an infinite scroll, to a billion concurrent viewers and a million concurrent posters?

Provide an in-depth overview of the different methodologies for executing asynchronous method calls in iOS. Explore the role and purpose of completion handlers, dissect the intricacies of async/await, and touch upon other valuable techniques leveraged to proficiently handle asynchronous tasks.

Design the system for the iOS Calendar appI would appreciate it if you could develop a UI that resembles the iOS calendar. Your task is to create a custom layout for the collection view, particularly focusing on the frameForCellAtIndexPath method. This method is responsible for calculating the frame for each cell in the collection view.

Deepdive the architectural design of a file manager app

In what ways are OperationQueue and GCD dissimilar?

In iOS development, can you explain the concept of threading? Additionally, identify the different thread types available within iOS, and explain the circumstances in which each type is most applicable.