With its most recent privacy backlash seemingly behind it, Facebook surged ahead to a new traffic record in the U.S. during the month of June.

FORBES: Facebook Hits New Traffic Record

Twitter also posted record traffic, with 31.8 million unique U.S. visitors in July compared with 30.6 million in June and 27 million in May.

FORBES: Morning Tech Wrap: Skype, HP, Facebook

The railroads retort that despite record traffic and profits, their return on investment since 2000 has been only 8%, which according to the Surface Transportation Board, another federal regulator, barely covers the cost of capital.

ECONOMIST: American railways