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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 .
 vulnerabilities: vulnerability; recent weeks: time; Google: vulnerable system owner; Tumblr: vulnerable system owner; Twitter: vulnerable system owner; Facebook: vulnerable system owner
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: discover vulnerability 
  Option: vulnerable system owner, vulnerability, capabilities, time, vulnerable system version, discoverer, common vulnerabilities and exposures, supported platform, vulnerable system 
Text: {0} 
Answer:
 vulnerabilities: vulnerability; recent weeks: time; Google: vulnerable system owner; Tumblr: vulnerable system owner; Twitter: vulnerable system owner; Facebook: vulnerable system owner