President Donald Trump signed an executive order Monday to keep TikTok operating for 75 days, a relief to the social media platform’s users even as national security questions persist.TikTok’s China-based parent ByteDance was supposed to find a U.S. buyer or be banned on Jan. 19. Trump’s order could give ByteDance more time to find a buyer.“I guess I have a warm spot for TikTok,” Trump said.Trump has amassed nearly 15 million followers on TikTok since he joined last year, and he has credited the trendsetting platform with helping him gain traction among young voters. Yet its 170 million U.S. users could not access TikTok for more than 12 hours between Saturday night and Sunday morning.The platform went offline before the ban approved by Congress and upheld by the U.S. Supreme Court took effect on Sunday. After Trump promised to pause the ban on Monday, TikTok restored access for existing users. …