By Alexei Oreskovic SAN FRANCISCO (Reuters) – Instagram, the mobile photo service owned by Facebook Inc, is expanding its nascent advertising business beyond the United States and will begin showing ads to users in Britain, Canada and Australia, the company said on Monday. The ads will start to appear on versions of the service in the three countries later this year, Instagram said in a post on its official blog. A Facebook spokesman said that Instagram will initially work closely with a handful of advertisers in each country. Facebook introduced ads within Instagram in the U.S. in November, working with brands such as Levis and ice cream company Ben and Jerrys. Instagram said on Monday that the U.S. ads have in some cases generated results well above the ad industrys average for performance, though it did not provide details.