4chan is just one of the data sources you can monitor using Signal. You can find conversations by alt-right groups, threats of violence against a person, organization or group, and more, which makes it a valuable data source for security professionals.
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What Security Professionals need to know about Dark Web Forums
Cybercriminals use dark web forums as a means to communicate about all manner of activities, such as planning cyberattacks, sharing new tactics and selling illegal goods or stolen data.