SAN FRANCISCO: Popular online bulletin board Pinterest on Wednesday began pushing ‘pins’ sponsored by advertisers into countries outside the United States, starting with Britain. San Francisco-based Pinterest introduced ‘Sponsored Pins’ about 18 months ago, making money by letting brands or firms pay to display advertising in form of posts ‘pinned’ to virtual bulletin boards at the service. “We are now pushing into international markets aggressively,” Tim Kendall, Pinterest monetisation and advertising president, said. Kendall said the expansion would begin in Britain because that is a ‘priority market’ with a large number of Pinterest users, including businesses.