To younger people – that is, anyone under the age of 20 – Microsoft’s spreadsheet program, a tool as essential to accountants as saws are to carpenters, is the contemporary equivalent of mom jeans, handwritten thank-you notes and cravats: stuff that oldies care about. How come, then, that the hashtag #excel has had 3.4bn views on a certain social media platform and that one Excel expert on that platform has 2.7 million followers and 9.7m likes for their tips on using Excel?