NEW YORK ( TheStreet) -- Google ( GOOG - Get Report) disclosed in a regulatory filing Tuesday that it took a $500 million charge earlier this month related to a federal advertising probe. The search giant said the charge was taken "in connection with a potential resolution of an investigation by the Department of Justice into the use of Google advertising by certain advertisers." Shares of Google fell 0.1% in pre-market trading Wednesday. In other Google-related news, the company is lobbying to allow Nevada become the first state to legally operate Google self-driving cars, according to The New York Times. The company says its cars could be used to perform deliveries or act as taxis on Las Vegas' casino strip, the report said. Visa ( V - Get Report) said Wednesday it is introducing a new simplified payments system that will allow customers to purchase goods across the Web with a single click. The service will be introduced to customers in the U.S. and Canada by this year's holiday season. Shares of Visa rose 0.1% in pre-market trading Wednesday to $80.45. Groupon may file for an initial public offering shortly, according to AllThingsDigital. The group buying site reportedly wanted to file as early as this week, but its investment bankers advised against it. An IPO is likely to value Groupon at more than $15 billion. Facebook made its users' personal information available to third parties, including advertisers, according to security software company Symantec ( SYMC). These third parties accidentally had access to personal account information, such as profiles, photographs and chat, and could have posted messages, Symantec said. Facebook said it is taking "corrective action to help eliminate this issue." --Written by Olivia Oran in New York. >To follow the writer on Twitter, go to http://twitter.com/Ozoran. >To submit a news tip, send an email to: email@example.com.