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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