736
Tumblr has joined the ranks of other high - profile technology companies , such as Twitter , Facebook and Google , that have all revealed vulnerabilities in recent weeks that could have been exploited , or were actually exploited , for harvesting the private information of some users .
 discover vulnerability: have all revealed
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 discover vulnerability: have all revealed