CrestaProject

<a href="https://crestaproject.com/cresta-facebook-messenger-demo-page/" rel="nofollow ugc">Plugin Demo</a> | <a href="https://crestaproject.com/downloads/cresta-facebook-messenger/" rel="nofollow ugc">Plugin Homepage</a>
With Cresta Social Messenger you can allow your users or customers to contact you via Facebook Messenger simply by clicking on a button. Users may contact you directly in private messages on your Facebook page and continue the conversation on Facebook Messenger. 
You can use the floating button which is positioned at the bottom right of the site or a button inside post or pages using the [cresta-facebook-messenger text=”Need Help?” icon=”yes” position=”top”] shortcode. 
Cresta Social Messenger is compatible with WooCommerce and WPML.
Some features
<ul>
<li>Add the button to open Facebook Messenger at bottom right of your site</li>
<li>Use the shortcode [cresta-facebook-messenger] to add the Facebook Messenger button in your posts or pages</li>
<li>Choose which pages to showo the Facebook Messenger button</li>
<li>Mobile version: click the button and automatically open Facebook Messenger App (if installed)</li>
<li>and more…</li>
</ul>
PRO version features
<ul>
<li>Change position of the box button</li>
<li>Change colors of the box button</li>
<li>Add tooltip on the box button</li>
<li>Change box size</li>
<li>Facebook Messenger widget</li>
<li>Different Animations</li>
<li>and much more…</li>
</ul>

Cresta Social Messenger

Allow your users and customers to contact you via Facebook Messenger with a single click.

Pham Thanh

Insert quick call buttons, chat Facebook, Skype, Line, quick contact via Zalo, Viber, Contact Form 7 … all wrapped up in a Group Contact button neatly displayed. The plugin is completely free for WordPress websites.
<h4>Currently the Plugin is providing the following display functions that allow website owners to customize:</h4>
<ol>
<li>Customize phone number</li>
<li>Customize your Facebook ID to make chat on Messenger</li>
<li>Customize chat via Zalo, Viber, Skype, Line…</li>
<li>Customize Shortcode Contact Form</li>
<li>Add embed code: Google Analytics, verification tag, embed code css, js, script code, meta tags…</li>
</ol>
Empty fields mean the corresponding function button is hidden.
<h4>Need support</h4>
If you want to get support, please visit <a href="https://www.phamhuuthanh.com" rel="nofollow ugc">PHT Blog</a> for more detail.

Call Now – Group Contact Buttons – PHT Blog

Insert call now buttons, chat Facebook, quick contact via Zalo, Viber, Skype, Line, Contact Form 7 ... all wrapped up in a Group Contact button neatly …

Cresta Social Messenger vs Call Now – Group Contact Buttons – PHT Blog