Some of the world's biggest car makers have started advertising their vehicles directly to women in Saudi Arabia.
The swift move follows the official announcement on 27 September by King Salman that the country's ban on women drivers will end in June next year.
The decision has immediately created a potential new market of several million, very wealthy, potential car buyers.
Among the firms using Twitter for their adverts are VW, Ford and Nissan.
According to the Bloomberg news agency, the biggest sellers of cars in the country are Toyota and Hyundai, whose SUVs (sports utility vehicles) are especially popular.