By Gabriel Debenedetti WASHINGTON (Reuters) – When Americans voted to renew President Barack Obamas lease on the White House in November 2012, more than 9 million citizens took to Facebook to click the Im a Voter button, showing their online friends that they had cast a ballot. The feature was available for voters in India as the worlds largest democracy chose a new prime minister, Narendra Modi, in voting over recent weeks. Over 4 million Indian voters used the Im a Voter button during the countrys parliamentary elections, Facebook said. For Facebook, this is another effort to integrate its services into the everyday life of people around the globe as it seeks to increase its number of users, particularly in emerging markets.