This is how it worked: People we recruited from Facebook and Twitter “lent” us their Tinder profiles, and the bot convinced Tinder that their profiles were in geographical locations where the vote was close. In these places, the proportion of 18-25-year-olds was high enough that they could swing the election — if they turned out at the national average. Using the photograph of the person who’d lent their profile, the program would automatically swipe “yes” on every user, and if someone swiped “yes” back, creating a “match,” the bot would ask about the user’s voting plans.If the user planned to vote for Labour (or whatever party best placed to beat the Conservatives), the bot sent a message with a link to the nearest polling station. If the user planned to vote for another progressive party, the bot asked if he or she would consider a tactical vote to beat the Tories, voting for the progressive party most likely to beat the Conservatives in their area. And if the user was voting for a right-wing party or was unsure, the bot sent a list of Labour policies, or a criticism of Tory policies. People who lent their profiles could jump in and chat at any time. And they did.