An anonymous reader shares a report: On Wednesday, the exterior of Twitter's San Francisco headquarters bore an eerie message: "Ban Russian Bots." Someone -- the company doesn't know who -- projected the demand onto the side of its building. Bots, or automated software programs, can be programmed to periodically send out messages on the internet. Now Twitter is scrambling to explain how bots controlled by Russian meddlers may have been used to impact the 2016 president election. Twitter was designed to be friendly to bots. They can help advertisers quickly spread their messages and respond to customer service complaints. Research from the University of Southern California and Indiana University shows that 9 to 15 percent of active Twitter accounts are bots. Many innocuously tweet headlines, the weather or Netflix releases. After the election, there was little discussion inside the company about whether the platform may have been misused, according to people familiar with the matter who asked not to be identified because it is private. But the ubiquity and usefulness of bots did come up. At one point, there were talks about whether Twitter should put a marking on bot accounts, so that users would know they were automated, one of the people said. Yet most of the conversation after the election focused on whether Trump's tweets violated Twitter's policies, the person said.