Facebook Messenger is an instant messaging service and application. You can message friends, family, and even your favorite whisky—Johnnie Walker.
The Amazon Echo is a hands-free speaker you control with your voice. It connects to the Alexa voice service to play music, order a car, or even learn about whisky—instantly. All you have to do is ask.
Google Home is a voice-activated speaker. It can distinguish your voice from others in your home so you get a more personalized experience. All you have to do is ask it questions.