Facebook Messenger Marketing

Facebook Messenger Marketing by ShopMessage is a conversational marketing platform that drives sales for Shopify and Shopify Plus merchants using Facebook Messenger.

Pros:

• It’s quick to install and fairly straightforward to understand. 
• Automatically send targeted, personalized Facebook Messenger messages to your store visitors.
• You can use it to quickly grow your Messenger list with one-click subscriptions.
• Drive sales with abandoned cart, browse abandon, welcome series, upsells, shipping notifications, custom Messenger menus, and campaigns.

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Cons:

• Some reviews suggest issues with the working of the app itself and difficulty in sending messages to customers. 
• Similar to the above point, their support and responsiveness have been brought up in their negative reviews. 
• There are only a few integrations available. So you may not be able to connect it with your existing tech stack.