Rory Cellan-Jones Technology correspondent:

For the past week, I’ve been running a very successful small business via Facebook. It is called VirtualBagel and more than 3,000 people from around the world have decided they “like” it – despite the fact that it does, well, absolutely nothing. But in running this non-existent firm I have learned quite a bit about the value of those “likes” prized by so many big brands, and the usefulness of Facebook’s advertising.

 

Read more about this on the BBC’s site at http://www.bbc.co.uk/news/technology-18819338