File photo of Narendra Modi.
Narendra Modi, to be India's next prime minister, has taken to Twitter to thank fellow leaders in Japan, Russia, Sri Lanka, Nepal and Australia for their good wishes.
Later in the evening, Mr Modi also thanked the US Secretary of State John Kerry who had wished him after the national election results were announced on May 16. "@JohnKerry Thank you Mr. Kerry. We will strengthen relations between our 2 vibrant democracies in the years to come," Mr Modi tweeted.
Mr Modi had earlier thanked Canadian Prime Minister Stephen Harper and Russian President Vladimir Putin.
Washington, along with European powers, boycotted the 63-year-old for a decade and denied him a visa over religious violence in Gujarat in 2002 while he was the state's chief minister.
About 1,000 people, mostly Muslims, were killed. Mr Modi has never been found guilty of wrongdoing over the riots, and has denied any wrongdoing.
Mr Kerry tweeted congratulations to Modi on Friday after a landslide win for his Hindu nationalist Bharatiya Janata Party, saying he looked forward to working with him and "growing shared prosperity/security".
Britain had also boycotted Modi, but British Prime Minister David Cameron sent a message of congratulations on Friday which was acknowledged by Mr Modi the day afterwards. "Hoping to further strengthen India-UK relations," he wrote.
President Barack Obama telephoned Modi but has yet to comment in person. He had warm words for his predecessor on Saturday, however.
As Dr Manmohan Singh left office after 10 years in power, Obama called to tell him that that there were "very few people in public life that I have admired or appreciated more".
Mr Modi has displayed no rancour publicly about his treatment by Washington, telling an interviewer earlier this month that foreign relations "should not and cannot be influenced by incidents related to individuals".
But analysts are looking closely at how the world's biggest democracies can work together with Mr Modi at the helm and following a highly damaging row over the arrest of an Indian diplomat in New York in December.