1) That's irrelevant. I'm speaking to the importance of the ability to reason a linked list which is not really related to 'practical examples of linked lists in a web development context'. To quote silentbicycle above: "It's a linked list, people." We're not talking about 'the latest developments in red-black tree algorithms'.

However... 2) Probably every list of objects you throw around in whatever abstraction providing framework you're using.