SEATTLE (Reuters) - Slack Technologies Inc on Tuesday announced it has added another 1 million paid users as the company begins to face increased competition in the workplace collaboration software market.

(Reuters) - Uber Technologies Inc [UBER.UL] said on Tuesday it signed an agreement with U.S. space agency NASA to explore concepts and technologies needed for passenger and cargo air transportation within an urban area.

DETROIT (Reuters) - Uber Technologies Inc said on Tuesday it would work with the U.S. Army to advance research on a novel, quiet aircraft rotor technology that could be used in future flying cars, or military aircraft.

(Reuters) - Major technology and aerospace companies including Amazon.com Inc , Intel Corp , Qualcomm Inc , Raytheon Co and Airbus SE are vying to take part in a new slate of drone tests the United States is set to announce on Wednesday, people familiar with the matter told Reuters.

BERLIN (Reuters) - German premium brand Audi on Tuesday said it plans to sell about 800,000 battery-electric and hybrid powered cars in 2025, as it seeks to catch up with electric car rival Tesla and emerge from a damaging emissions-cheating scandal.

(Reuters) - Walmart Inc's online grocery delivery partnerships with ride-hailing services Uber and Lyft have ended, according to two sources, a potential setback for the retailer's ambitions to challenge Amazon.com Inc head-on with speedy delivery of groceries to people's homes.

(Reuters) - Alphabet Inc's Google has sent online publishers an update to its ad-serving platform, which allows them to select advertising tech vendors that comply with new European data privacy laws, news website Axios reported on Tuesday.

DUBLIN (Reuters) - Facebook will no longer accept advertisements from outside Ireland related to the country's May 25 abortion referendum, the U.S. firm said on Tuesday, in its latest move to boost the transparency of its political advertising.

FRANKFURT/BRUSSELS/PARIS (Reuters) - Europe's General Data Protection Regulation (GDPR) has been billed as the biggest shake-up of data privacy laws since the birth of the web.

STOCKHOLM (Reuters) - Fast-growing financial technology business iZettle is set to be one of the biggest European fintech companies to list after announcing plans on Tuesday to join the Nasdaq Stockholm stock exchange this year.

(Reuters) - Cohu Inc will buy rival Xcerra Corp for about $796 million, the semiconductor testing company said on Tuesday, two months after a U.S. security panel blocked Xcerra's sale to a Chinese state-backed fund.

(Reuters) - U.S. semiconductor testing company Cohu Inc said on Tuesday it will buy rival Xcerra Corp for about $796 million in a cash-and-stock deal.

SEOUL (Reuters) - South Korea's LG Display said on Tuesday it is beefing up a strategic alliance with Alphabet Inc's Google for stable panel supplies and new product development.

MOSCOW (Reuters) - Russia's No.2 mobile phone operator Megafon said on Tuesday it would set up a joint venture with Gazprombank and state defense conglomerate Rostec to develop digital projects.

FRANKFURT (Reuters) - Alibaba Group has bought the entire share capital of Rocket Internet's South Asian ecommerce platform Daraz Group, Rocket Internet said on Tuesday.

STOCKHOLM (Reuters) - Fast-growing financial technology company iZettle said on Tuesday it planned to list on the Nasdaq Stockholm stock exchange this year, making it one of the biggest European fintech companies to list so far.

SEOUL/SINGAPORE (Reuters) - Investors in global chipmakers have had a rocky ride in the last few months on worries about a slowing smartphone market, but a clamor for more video content from consumers is underpinning buoyant sales for memory-chip makers.

(Reuters) - Credit-monitoring firm Equifax Inc said on Monday it has sent a letter to several U.S. Congressional committees providing additional details on data that was breached in a cybersecurity incident in September.

(Reuters) - Snapchat-owner Snap Inc said Tim Stone, an Amazon.com Inc veteran who had led the integration of the online retailer's $13.7-billion Whole Foods acquisition, would replace Andrew Vollero as chief financial officer.

(Reuters) - Uber Technologies Inc [UBER.UL] on Monday said it has retained a former top U.S. transportation official to advise it on safety after a fatal self-driving crash in March, but it declined to comment on a technology website's report that a software flaw was responsible for the accident.

(Reuters) - Snapchat-owner Snap Inc said Tim Stone, an Amazon.com Inc veteran who had led the integration of Whole Foods acquisition, would replace Andrew Vollero as chief financial officer.

(Reuters) - Microchip Technology Inc said on Monday it cannot confirm media reports that the Chinese government has approved its $8.35 billion bid to buy Microsemi Corp.

(Reuters) - Uber Technologies Inc [UBER.UL] on Monday said it has hired a former U.S. regulator to advise the company on safety, but would not confirm a technology website's report that a software flaw was responsible for a fatal accident involving one of its self-driving cars in March.

OSLO (Reuters) - Facebook will double the size of its data center in Sweden's northern city of Lulea, raising its total investments in the region to about 8.7 billion crowns ($987 million), the company said on Monday.

(Reuters) - Silicon Valley self-driving startup Drive.ai said on Monday it will launch a pilot program for an autonomous ride-hailing service in July in Frisco, Texas, with safety drivers present.

(Reuters) - Uber Technologies Inc [UBER.UL] said Monday it has hired a former National Transportation Safety Board (NTSB) chairman to advise the company on its safety culture after a fatal self-driving crash in Arizona.

CAIRO (Reuters) - Egypt's parliament passed a law on Monday regulating ride-sharing apps Uber and Careem, potentially ending a lawsuit that could shut them down in one of their biggest markets but imposing new fees and data sharing requirements.

SAN FRANCISCO (Reuters) - Alphabet Inc's Google on Monday launched a spinoff of its Android operating system for home appliances and other machines, following mixed results with Android offshoots for cars, smartwatches and televisions.

NEW YORK (Reuters) - Billionaire investor Warren Buffett on Monday said buyers of bitcoin, which he has characterized as "rat poison squared," thrive on the hope they'll find other people who will pay more for it.

NEW YORK (Reuters) - Billionaire investor Warren Buffett on Monday said buyers of bitcoin, which he characterizes as "rat poison squared", thrive on the hope they'll find someone else who will pay more for it.