I was searching for a way to get notified, or to view the recent modifications, but I could not find any.

For instance, when a user add a new note to a shared task,
or when a user add a new task to a shared list.

It would be really helpful to have a kind of "recent changes" and "recent changes by contacts". So that one does not miss a new important note, or task modification.

Unless there is something already there, I would suggest such feature.

If a task had a "last modification date", it would be easy to search tasks and sort by this date.