Overseas markets bring in more advertising revenue than the United States for Facebook Inc, amounting to 51 percent of global ad sales in the first quarter, with growth in Asia the fastest in the world at 57 percent, company executives told Reuters. While Facebook has reported regional growth in percentage terms, this is the first time it has detailed ad sales outside the United States and Canada as a percent of worldwide sales. Like the advertisers it courts, the world’s largest social media platform looks at international markets for growth.