In incident response protocols, incidents are categorized based on their severity, impact, and the urgency of the response required. The categorization helps in prioritizing incident response activities and allocating resources accordingly. A CAT 1 (Category 1) incident is typically considered the highest priority, involving significant threats that require immediate response. Given the scenario where a malware incident in one of the largest social network companies must be reported within 1 hour of discovery/detection, this indicates a high-priority incident due to the potential widespread impact and the need for a rapid response to contain and mitigate the malware's spread. The urgency of the reporting timeframe suggests that the incident is considered critical, aligning with the characteristics of a CAT 1 incident, which necessitates immediate action to prevent significant damage or disruption to the company's operations and services.