Brand Communities extend the brand experience online and are made up of a number of tools which can be used by the brand community to:

Engage with the brand
Starbucks, Dove,

Share brand experiences with other brand customers and advocates
X-factor,

Facilitate a lifestyle encouraged by the brand
Harley Davidson, Jeep and Mini USA, 

Extend the brand experience online
X-factor, Liverpool Football Club, Littlest Pet Shop,
Create a brand experience – Harley Davidson, Mini
Engage customers – Starbucks, Littlest Pet Shop
Support a brand experience – X-factor, UEFA
Support fans – football clubs
Develop brand awareness – Dove