Congestion in cities is a global problem. There are roughly 4 million vehicles in Bangalore, and the average worker in London spends around 227 hours a year commuting. Using crowdsourced data, Urban Engines is helping cities to become smarter, less congested and more efficient.

Using location-based demographic data purchased from mobile carriers, StreetLight Data provides insights into how people move through cities, and where they spend time. But as privacy concerns grow, what are the benefits for consumers?

There's an increasing consumer awareness of the value of their personal data - and in response, those who gather it are finding ways to emphasise the 'value exchange' while becoming more transparent about how it's used.

Nearly 80% of people think companies use their personal data to make more money, so they're reluctant to share it. With over three quarters of people concerned about online privacy, Citizenme gives them back control of their data. But what does it mean for users and advertisers?