Participant hold their laptops in front of an illuminated wall at the annual Chaos Computer Club (CCC) computer hackers' congress, called 29C3, on December 28, 2012 in Hamburg, Germany.
Participant hold their laptops in front of an illuminated wall at the annual Chaos Computer Club (CCC) computer hackers' congress, called 29C3, on December 28, 2012 in Hamburg, Germany. - 

Today, we kick off a series on Wall Street technology. We start with something pretty low-tech: chat rooms.

Banks and traders are now under investigation, accused of meeting in chat rooms to hatch schemes to manipulate markets.

Robert Friedman, Editor-at-Large at Bloomberg News, joins Marketplace's Mark Garrison to discuss. 

Follow Mark Garrison at @GarrisonMark