GigaOm also points out that FireChat's a kickass app for big summer festivals like Burning Man, since cell reception is notoriously garbage and it's hard to find friends or locate stuff like water or beer tents when you can't use iMessage or Twitter.
Business Unit or BU refers to a division, facility or department of an organization. 1  Examples of business units include retail outlets and human resource department.
The company or subsidiary is a corporate body; the business units are the various parts comprising the entity. A business unit is a division, department or functional area within a company responsible for a specific corporate activity.