Facebook on Monday dismissed complaints from German authorities that it doesn't adequately cooperate on terrorism and other serious crime investigations and urged police to better formulate their requests for information.
Three people who committed violent attacks in Germany last month - a mass shooter in Munich, an axe-and-knife attacker in Wuerzburg and a suicide bomber in Ansbach - were all active on Facebook.
The social media giant said in a statement that it had supported the authorities during the three investigations and would continue to support the fight against terrorism.
In the wake of the attacks, several security officials in Germany's federal states called for new legislation that would require social media sites to immediately hand over information in ongoing terrorism investigations.
A report in the Sunday edition of conservative newspaper Die Welt claimed that Facebook had responded to only a third (37 per cent) of police requests for information over the past three years.
"We respond to valid requests relating to criminal cases. Each and every request we receive is checked for legal sufficiency and we reject or require greater specificity on requests that are overly broad or vague," Facebook said in a statement.