Sydney / AP Playing online games may boost teenagers’ school results while spending time on social networks such as Facebook could do the opposite, according to an Australian study. The research, based on the performance of 15-year-old Australians in the globally recognised Program for International Student Assessment (PISA) tests, looked at the relationship between internet usage and educational outcomes. …

  Bloomberg Twitter Inc. is offering about a quarter of the space at its San Francisco headquarters complex for sublease, adding to a growing amount of excess offices available in the city as the technology industry cools. About 78,800 square feet (7,320 square meters) is listed for sublease on the seventh floor of 1355 Market St., a renovated 1930s furniture …

  Bloomberg Qualcomm Inc., which has struggled to get paid licensing revenue in China, said it signed up phonemaker Vivo Communication Technology Co., helping cement its position in the world’s largest phone market. Vivo, the third-biggest smartphone maker in China, agreed to pay Qualcomm for technology used in 3G and 4G phones, the US chipmaker said. The deal with Vivo …