Marketers have spent their careers (and virtually all of their ad budgets since World War II) trying to influence the former, but evidence is mounting that the latter is not only virgin territory, but may actually be more influential than anyone thought.

FORBES

That forced Mr Paulson, Ben Bernanke, the Fed's chairman, and Timothy Geithner, the president of the New York Fed (the three are virtually joined at the hip) to pursue rescues ad hoc.

ECONOMIST: Saving Wall Street

Most importantly, the 18% price-per-ad growth in North America, despite easy comps with virtually no Newsfeed revenue a year ago, suggests we will need to see a pricing-power inflection for the multiple to expand, or even for it to remain stable, in early 2014 and onwards when comps become harder.

FORBES: Feeling Asocial? Bernstein Cuts Facebook To Market Perform