Duolingo touts $1.5B valuation; language company to hire 100 more people, mostly in Pittsburgh

Duolingo touts $1.5B valuation; language company to hire 100 more people, mostly in Pittsburgh

Duolingo has earned the title of Pittsburgh’s first tech “unicorn” — investing lingo for those rare startups that achieve a valuation topping $1 billion. Now valued at $1.5 billion …