The heads of US intelligence agencies have been testifying before a congressional committee on issues regarding threats to the country's national security.
Recent political revolts have exposed the failure of intelligence services to timely alert the White House about the situations in Egypt and Tunisia.
Questions have emerged as to how the intelligence services were less well informed than people on Facebook and Twitter about the spirit of revolution enveloping the Middle East.
Al Jazeera's John Terrett reports.
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