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By Alexandria Sage and Paul Lienert SAN FRANCISCO/DETROIT(Reuters) – Google's self-driving car team is expanding and hiring more people with automotive industry expertise, underscoring the company's determination to move the division past the experimental stage. The operation now employs at least 170 workers, according to a Reuters review of their profiles on LinkedIn, the business-oriented social network. Many are software and systems engineers, and some come from other departments at Google.

Google will need to add to the number of partners to develop the next phase of its self-driving project, but the president of that project did not name any of those partners-to-be. John Krafcik, president of the Google self-driving project, in a speech on Tuesday at an auto industry conference in Detroit, did not mention the name of any automaker or say whether it would partner with any automakers to build a fully autonomous car. Krafick said Google wants to form some partnerships in 2016.

By Yasmeen Abutaleb SAN FRANCISCO (Reuters) – Brazil's President Dilma Rousseff capped off her U.S. tour on Wednesday with a visit to Silicon Valley, where she met with top technology executives and took a ride in Google Inc's self-driving car. Rousseff used her visit to strengthen ties with U.S. technology companies after visiting Washington, D.C. and New York City earlier in the week. During her visit, Google announced it would inaugurate a new engineering space in Belo Horizonte in November that will more than double the number of engineers working in Brazil on some of the company's core products.

By Yasmeen Abutaleb SAN FRANCISCO (Reuters) – Twitter Inc Chief Executive Officer Dick Costolo abruptly announced he was stepping down on Thursday amid increasing scrutiny of the company's slow user growth and inability to attract advertisers at the same rate as its competitors. Costolo will be replaced by co-founder Jack Dorsey on an interim basis. According to a source familiar with the matter, it was Costolo's decision to leave, and Costolo said he brought it up with the board last year as it began talking about succession planning.

Shares of LinkedIn Corp, operator of the most popular social network for professionals, fell 20 percent in early trading on Friday, wiping out more than $6 billion of market value, after the company slashed its full-year forecast. LinkedIn reported on Thursday its slowest quarterly revenue growth since it went public four years ago. The surprisingly weak results followed Twitter Inc's on Tuesday. Twitter's stock fell by as much as 24 percent, slicing about $6 billion off its market value.

Google Inc submitted plans on Friday for a vastly expanded headquarters at the Silicon Valley city where the tech giant is based, presenting a bucolic vision of movable structures to be built under curving and translucent canopies. The submission of the plan to the City Council in Mountain View, California, which the company chose for its headquarters 15 years ago, marks the first step in what city officials describe as a long review process. The new headquarters would give the Internet company the room for an additional 10,000 employees, compared to the 20,000 Google staffers that currently work in the city, a Google spokeswoman said. Google's blueprint for new headquarters in the city's North Bayshore district has gathered widespread attention because the design is seen as architecturally innovative.

By Alexei Oreskovic, Sarah McBride and Malathi Nayak SAN FRANCISCO (Reuters) – After two years of popping up at high-profile events sporting Google Glass, the gadget that transforms eyeglasses into spy-movie worthy technology, Google co-founder Sergey Brin sauntered bare-faced into a Silicon Valley red-carpet event on Sunday. He'd left his pair in the car, Brin told a reporter. The Googler, who heads up the top-secret lab which developed Glass, has hardly given up on the product — he recently wore his pair to the beach. …