According to Statista global revenue from mobile advertising almost doubled in 2012, increasing from $4.9 billion back in 2011 to $9.1 billion.
In North America alone, the amount spent on mobile ads per mobile subscription reached $9.39 on 2012 compared to $4.53 on the previous year. That fact puts North America as the leader in mobile advertising worldwide. Western Europe follows with $2.91 spent on mobile ads per mobile subscription, more than double the amount spent on the previous year.
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Global public debt is increasing every second. This debt clock shows government debt, in dollar terms, for almost all countries. Governments with the highest debt include the United States, Canada, Brazil, Australia, India, China, and several western European nations.
Additional indicators such as public debt per person, public debt as percentage of GDP, total annual debt change, and country debt comparisons can be seen in the interactive map at: The Economist: The global debt clock