The company's Web crawlers, offered under a subscription called Babel X, trawl some 40 online sources, scooping up data from popular sites such as Instagram and a Korean social media platform as well as inside "dark Web" forums where cybercriminals lurk.

Police departments investigating a crime might use the service to scan posts linked to a certain neighborhood over a specified period of time. Stadium managers use it to hunt for security threats based on electronic chatter.

The Department of Homeland Security, county governments, law enforcement agencies and the FBI use it to keep tabs on dangerous individuals, even when they are communicating in one of more than 200 languages, including emoji.

The firm, staffed by former government intelligence veterans, is part of an insular but thriving cottage industry of data aggregators that operate outside of military and intelligence agencies. The 100-person company said it is profitable, something that is rare for a tech start-up in its third year. (It declined, though, to release financial details.) It recently took on $2.25m from investors, bringing its total capital raised from investors to just over $5m.

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