Here is an example of a recent User Story with early business requirements. They are short an clear initially. A developer, designer or stakeholder can look at this and understand what's required. In this case, to integrate an existing SDK to allow deep linking from Facebook into our application.
The below graphic from the lecture introducing business requirements quite aptly describes the relationship between business analyst, user and designer. The analyst here could also represent a research or data analyst, both of whom also contribute greatly to the user story creation.