A recent "fake news" scandal involving IT giant DeNA Co. shows how quickly bogus health information can make the rounds online.

According to a 300-page report released last month by a third-party panel looking into the scandal, Welq — one of the firm's 10 content curation sites and one that focused on health — totally lacked the awareness that medical information should be handled carefully because inaccuracies can do serious harm to people's health.

Instead, Welq worked hard to find an algorithm it could use to mass-produce articles that would dominate Google's search rankings. The site managers also naively believed that, in an era when the most rigorously researched and reported works of journalism struggle to sell, they could strike it rich as long as they kept readers attracted to the site, regardless of accuracy.