The new service - called - claims to be the first private hire service in the UK to take journey bookings via Twitter. The company's green credentials are based on using what it claims is the greenest car on the market, the Toyota Prius.
Bookings can be made by sending a direct or private message to greentomatocars outlining journey details. The company will then send a Tweet back, containing a unique booking reference confirming the booking.
The company also plans to use the micro-blogging service to encourage customers to participate in an online conversation around environmental issues.
Founder Tom Pakenham, said: "Twitter has become such a phenomenon and with so many people in London using it, we are delighted to be able to use Twitter to build a closer relationship with our customers and make booking a car simpler and easier than ever."
The launch is part of a growing trend towards companies offering last-minute bookings on Twitter.
Last week, a Twitter-based hotel booking engine launched called giving members that chance to check-in within 48 hours and take advantage of special deals.
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