Facebook had 2.23 billion monthly active users as of the second quarter of 2018. More than one billion people are active on Facebook every day worldwide.
In order to support small businesses, Facebook has introduced Messenger chat plugin for WordPress websites to build strong relationship with their customers.
According to Facebook, 1.3 billion users use Messenger every month. Many of the websites are highly likely to use Messenger and it would be nice and easy to connect website owners with Messenger users.
The plugin will convert website visitors into potential customers as the people who use Messenger can chat without signing up or logging into the website.
The plugin is free and can be acquired here on WordPress website.
You can see more information of Facebook Business website.