collage of people's head shots (Photo: Shutterstock)

(Bloomberg) –A database aggregating 1.2 billion users' personal information, including social media accounts, email addresses and phone numbers, was discovered unprotected on a server last month. So far, it's not clear how it got there.

Most of the data was collected by a company called People Data Labs, said Vinny Troia, chief executive officer of Night Lion Security, which is based in St. Louis. People Data Labs provides work emails and social media account details for what the company claims is a billion and a half people. That data is scraped from various sources and sold as a way to contact "70%+ decision makers in the US, UK and Canada," according to the company's website.

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