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For instance , back in late 2013 , a group of hackers published a database containing the usernames and phone numbers of approximately 4.6 million Snapchat users .
 ( data breach: published,  a database: compromised data, the usernames: compromised data, phone numbers: compromised data, 4.6 million: number of victim, Snapchat users: victim, a group of hackers: attacker, late 2013: time) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( data breach: published,  a database: compromised data, the usernames: compromised data, phone numbers: compromised data, 4.6 million: number of victim, Snapchat users: victim, a group of hackers: attacker, late 2013: time) 