Do you enjoy arguing with people on Twitter and idling away endless hours on Facebook? Isn’t it incredible that you get to do all that for free? Except, you know what they say – if you’re not paying, you’re the product. Companies that provide free services online make their money by extracting data from their users and then selling it on or using it to help advertisers target specific audiences. Now that business model has just been dealt a huge blow by the European Court of Justice.