They found that watching the pain suffered by a partner was enough to trigger activity in some - but not all - of the brain's pain centres.

BBC: Men and women reported similar levels of pain

Making sense of that activity is the province of Union Metrics, a measurement and analytics service and preferred partner of the fast-growing social blogging platform.

FORBES: Here's Exactly What It Looks Like When Something Goes Viral On Tumblr

On Aug. 1, a federal court in Rio de Janeiro gave Chevron and its partner, oil drilling firm Transocean, 30 days to suspend all its activity in Brazil.

FORBES: Chevron Not Leaving Brazil