Twitter ad sales hit by coronavirus but active users soar

(Reuters) - Twitter Inc pulled its first-quarter revenue outlook and forecast an operating loss on Monday as the coronavirus outbreak crimped ad sales, but said the pandemic boosted the number of active users on the microblogging platform.The outbreak has made social media services such as Twitter vital for a broader population than usual, as people look to stay abreast of the latest news from authorities and keep in touch with friends virtually. But many advertisers have pulled marketing..