June 4, according to foreign media reports, local time Saturday, a truck into the London Bridge crowd, Facebook's Safety Check function is activated.
Facebook sends a message to the user at the place where people can tell friends and family that they are still alive. It has been used for natural disasters such as hurricanes, as well as large-scale shooting and terrorist attacks.
Local law enforcement confirmed that more than one person was killed in the attack. The London Police Department said on Twitter that the attack and the Bolo market had been declared a terrorist attack.
The US Embassy in London has released a tweet in the UK to tell US citizens: If you are safe, please inform your friends and lover. If you use social media, please update the status. & Rdquo; it contains a link to the Safety Check.
In the past three years, Facebook's tool has been activated more than 300 times, but also because in some parts of the world can not activate the Safety Check and be criticized.
In response, Facebook no longer manually activates the tool, but relies on user-published activity to automatically trigger an alert to track the key words that are dangerous, such as the concentration of the "Earthquake & rdquo;" shooting & rdquo; or " The