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Congratulations: you have 50,000 Twitter followers! Respect: you have a million 'likes' on Facebook! Kudos: 5,000 professionals on LinkedIn have joined your group! But scratch beneath the surface and ask yourself three big questions: 1. What does this really mean? 2. What is this worth? 3. Who owns the data? I'm not a social media cynic by any stretch of the imagination. I know what it has done for our business, but that's not to say there aren't threats and challenges on the road ahead.

Speaking at the DMA's Data Protection Conference earlier this month, the Information Commissioner Christopher Graham repeated his warning to UK businesses to get ready for the EU law on cookies, which comes into force on 25 May 2011.

As Foursquare's 10 million members check into locations in cities around the world, much of that location data can be accessed in unique and fascinating ways, thanks to the service's ever-improving API.