We've got lots of people who know how to use social media, so that savviness isn't a prerequisite for a job at Walmart. It depends on the job that we're hiring for.

There's a thing that's being talked about a lot at the moment: personal branding. I think people, if they're interested in being found, they need to think about their social brand. We sometimes look for that kind branding. It's one of the ways, an exclusive way, that we look for people. It has been increasingly helping us find 'passive' people. I think the more you put yourself out there-if you're interested in being put out there, that is-the more likely you are to get found.

We use Twitter and Facebook for different things. We tend to use Facebook more to talk about Walmart and what we've got going on. We even have individual Facebook pages to represent the individual stores that we have, particularly in the US. We're doing a lot of work with Facebook in the US around having dialogue with our customers.