in the U.S. In September 2013, Rakuten acquired Singapore-based video streaming site Viki. In November 2013, Rakuten led a US$800,000 seed round of funding for Singapore-based consumer-to-consumer marketplace app Carousell. On February 13, 2014, Rakuten announced the acquisition of Tel Aviv-based web messaging company Viber Media for $905 million, to link up messaging with e-commerce. The Viber app is for making phone calls and sending free messages. On May 29, 2014, Rakuten Marketing acquired DC Storm, a UK-based technology company which specializes in marketing attribution modeling and data-driven marketing. In August 2014, Rakuten announced its purchase of Slice, a US company that provides online shopping services and sells business intelligence based on digital commerce measurement, for an undisclosed sum. In September 2014, it was revealed that Rakuten would acquire US rebate site operator Ebates Inc. for approximately US$952 million to give the company more access to US consumers and help it grow abroad, as it takes on rivals such as Amazon.com and Alibaba. Ebates offers coupons and cash rebates to customers who shop at its more than 1,700 partner retailers. In March 2015, Rakuten announced the acquisition of OverDrive, Inc., a wholesale distributor of e-books and other digital content that serves libraries and retailers, based in Cleveland, Ohio. The acquisition price was $410 million in cash. In 2019 private equity firm KKR announced it would be purchasing Overdrive from Rakuten. In June 2020 the acquisition was finalized. In 2015, Rakuten relocated its corporate headquarters from Shinagawa to the Tamagawa neighbourhood of Setagaya-ku, to consolidate its Tokyo offices and to accommodate future growth. Since 2015, Rakuten has invested in several ride-hailing services. In March 2015, Rakuten led a $530 million round of venture financing for Lyft, spending $300 million for a 12% stake in the company. In April 2016, Rakuten announced it would invest an additional $92 million in Cabify, which was founded in 2012 in Spain and is one of the largest ride-hailing services in Latin America. Rakuten previously invested $3 million in Cabify in 2015. Rakuten led a $500 million Series E round of funding in Middle Eastern transportation startup Careem, which closed out in June 2017. In April 2016, Rakuten participated in a $30 million round of financing for investing app Acorns. In August 2016, Rakuten confirmed that it had acquired the assets of bitcoin wallet startup Bitnet, with the assets to be used to create a research