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There was a time when Facebook, Twitter, Snapchat, etc. apps were all around 5-10Mb in size. Now they're 30-80Mb. That's on the developers, and makes the download take longer.

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Not all of that is the app makers' fault. These days they generally need to support 32-bit ARM (maybe 2 different flavors?), 64-bit ARM, @1x, @2x, and @3x assets, iPad and iPhone versions, etc all in one bundle.

Fortunately, Apple is adding new functionality ("App Thinning") to iOS 9 to strip unneeded stuff out from the bundle that the Store sends the device.

This is easy to tell before downloading the app (this size is usually listed) and doesn't require a comment. Apple has changed the max size limit for cellular downloads over time (it's now 100mb but used to be as small as 20mb), partially explaining the growth over time.

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