KUALA LUMPUR — The spread of online political rumors, false content and hoaxes has fact-checkers working overtime ahead of elections in Thailand, India, Indonesia and the Philippines. In February, a video first seen last year resurfaced on social media of Grace Poe, a Philippine politician, allegedly backing the blocking of Facebook in the country, where freedom of speech is ingrained in the constitution and the number of social media users is 76 million, much higher than the 61.8 million people who are registered to vote. But the video, which was posted by an account supporting President Rodrigo Duterte, who defeated Poe and other candidates in 2016 presidential elections, excluded some vital comments by the senator, who will defend her seat in May’s midterm elections. “Can you block a particular company like Facebook from being accessed in the Philippines? I know they do this in China,” Poe was shown saying in the video, which had omitted the preceding comments to the question she posed: “Not that we’re going to do this — I’ll be the first to disagree if they do.” The misleading video was flagged by Vera Files, a fact-checking organization that is part of an elections-focused collaboration called Tsek.ph and which includes some of the Philippines’ main newspapers, television stations and media academics.