online social network

One of the biggest and glitziest shopping malls in Europe opened last week in London, in a test of British consumers' ability to keep spending during a steep economic downturn. The shopping center, Westfield London, is also shaping up as a vast experiment in making over the humble billboard.

CBS Outdoor, a division of the CBS media conglomerate, has installed more than 100 digital advertising screens at Westfield, including a giant one covering 60 square meters, or 646 square feet.

"Community" continues to be the buzzword for businesses looking for a meaningful online presence. Everywhere you look there's another company bragging about its online social network, either to embrace clients or consumers or even to unite employees. As membership in social networks such as Facebook and MySpace continues to grow, brand-sponsored apps that tap into some network somewhere, somehow, have become common. But vibrant, successful communities are difficult to design and implement.