“Google policy is to get right up to the 'creepy' line and not cross it,” says the company's CEO. But when does insightful personalisation become intrusive? And how do brands build lasting relationships with consumers concerned about being spied on?

Advert-blocking browser plugins are growing at a rate of nearly 70% year-on-year. The most popular, AdBlocker, reached 150 million users in June 2014. And if people really are more likely to climb Mount Everest than click a banner ad, what is next for online advertising?

If you're planning a holiday, you'll probably have seen targeted advertising based on your browsing history. Vodafone targeted its roaming packages at people it knew were jetting off, and increased sales by 196%. But can data create more complex behaviour changes?

In 2015, it's no longer unusual to see a car that boasts 4G connectivity or a touch screen interface to control in-built gadgets. So perhaps it's a natural step for automotive engineering to transform vehicles' interiors into targeted advertising real estate.