903
On Tuesday , many users on Twitter , including journalists , posted screen shots of the phishing emails , prompting speculation that the hackers were harvesting victims ' contact lists to target more users .
 ( data breach: were harvesting,  the phishing emails: tool, the hackers: attacker, contact lists: compromised data, users: victim, victims: victim) 
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: were harvesting,  the phishing emails: tool, the hackers: attacker, contact lists: compromised data, users: victim, victims: victim) 