“It’s the pace of it,” says Deirdre McCarthy, RTÉ managing director of news and current affairs, and the woman in charge of Ireland’s largest newsroom. Even as stories are being tenaciously verified or debunked, fresh misinformation and disinformation – misinformation’s deliberate, more pernicious sibling – keeps rolling in. There are, as McCarthy says, “a lot of opinions online all the time”. Inside her office on the first floor of the RTÉ television building, there’s a bank of four television screens, with RTÉ and Virgin Media showing daytime programmes and BBC and Sky News gearing up for UK chancellor Rachel Reeves’s...