GigaOM writes, Joanna Shields, Facebook’s vice president and managing director of its Europe, Middle East and Africa operations is leaving the company and will become the chief executive of London’s Tech City Investment Organization (TCIO) and she is also going to be come the chairperson of the Tech City Advisory Group and Business Ambassador of Digital Industries. TCIO is group that was established by UK Trade & Investment (UKTI) in April 2011 to give boost to the tech cluster based in East London and helping to make it Europe’s center of innovation an location of choice for...