Romantic comedy He’s Just Not That Into You, which stars Scarlett Johansson and Jennifer Aniston, has topped the North American box office. The film, which follows a group of 20 and 30-somethings trying to work out the rules of dating, took $27.5m (£18.6m) in its opening weekend. Based on a best-selling book inspired by Sex and the City, it pushed kidnap thriller Taken into second place. Producers of He’s Just Not that Into You hope the romantic comedy will also benefit from the Valentine’s Day audience next weekend.