Cloud is useful in a number of different industries.
For commerce, cloud hosting is a viable alternative to other web hosting methods. It provides a cost-effective solution to handling consumer traffic to the servers. If you need more provisions for their usage, it can be arrange with the cloud provider or extra networked storage can be bought for a minimal cost.
For researchers and the science industry it provides a protective bubble to share ideas and studies to aid advancement. By having multiple research units connected in a community cloud it means that there will not be teams studying the same area of science in the same manner. Instead these teams would be able to pursue independent study that uses the findings of each others work as a basis for them.
For social media it allows unhindered growth. When the next Facebook or Twitter appears and requires large storage and usage capabilities from its servers there will be the option for a cloud community of dedicated servers and computers to provide this.