title: Facebook gives election ad data to U.S. special counsel: source
text: SAN FRANCISCO (Reuters) - Facebook Inc has turned over information about U.S. election ads it believes were bought by Russians to Robert Mueller, the special counsel in charge of investigating alleged Russian interference in last year’s election, a source familiar with the matter said on Wednesday. The information produced by Facebook included copies of advertisements and data about the buyers of the ads, the source said. 