Facebook Messenger Lets You Book an Uber - Bloomberg Business

Also see The message is the medium (The Economist, 3/2015)

"Taking another page from its counterparts in Asia, Facebook will add a feature for booking a ride through its messaging application. Users of Facebook Messenger in the U.S. will be able to summon an Uber car with a few taps starting on Wednesday.
The new feature for Messenger, which has more than 700 million users globally, will allow users to tap on a street address in a message and summon a ride. After booking, the app will let Uber customers easily share their estimated arrival times or coordinate splitting the fare with friends through Messenger. The feature is expected to be made available in other countries outside the U.S. later."

Facebook Messenger Lets You Book an Uber - Bloomberg Business