Founded in 2012, Tilt found early success on college campuses, where its app became a popular way to raise money for frat parties or split the expense of late-night pizza. Overseas, in Canada and Europe, user behavior looked closer to that of Venmo. But Tilt opted to focus on user growth instead of revenue and relied on other payments companies, like Stripe, for significant parts of its technology. When user growth slowed in the U.S., the company started to run out of options. For Airbnb, the deal marks its second acquisition this month. Last week the company acquired Luxury Rentals, a vacation rental company with a portfolio of high-end properties. With Tilt, Airbnb follows the tried-and-true playbook of combining payments and travel, a strategy that has served American Express well. Get the full story at Fast Company