What exactly does Instagram cache?

Question

Instagram

I have seen in the technologies that are used on the back of Instagram there is memcached, but I don’t quite understand where caching is appropriate on Instagram. Let's say, without the Internet, the video that I watched recently - does not start, photos - also
cannot cache the profile page, it can be updated at any time, it cannot cache the feed either. Who can tell where they still use caching and what they cache?)

Answer 1

Something you all mixed together. Memcached on the backend, and you're talking about some videos without the Internet...
Anything can be cached, including the profile and feed, likes and comments - it's just that at the right time this cache is reset (at a high speed of changes, such a cache is useless , certainly). Or maybe some technical information is cached.
Well, the exact answer to the question "what exactly Instagram caches" no one except themselves knows.

Answer 2

Open the debugger in the browser and see what's in localstorage