gistfile1.txt

Add code to template file

<?php echo $this->getLayout()->createBlock("Mageplaza\Sociallogin\Block\Buttons")->setTemplate("Mageplaza_Sociallogin::buttons.phtml")->setSocialNetworks('Google,Yahoo,Facebook')->toHtml(); ?>

You can put a social login button block on a CMS page

{{block class="Mageplaza\Sociallogin\Block\Buttons" name="buttons.sociallogin" template="Mageplaza_Sociallogin::buttons.phtml" social_networks="Google,Yahoo,Facebook"}}

Please copy and paste the code below to one of xml layout files where you want to show the social button block. 

<block class="Mageplaza\Sociallogin\Block\Buttons" name="buttons.sociallogin" template="Mageplaza_Sociallogin::buttons.phtml">
    <action method="setSocialNetworks">
    <social_networks>Google,Yahoo,Facebook</social_networks>
    </action>
</block>

Below is a code example of a block with 4 social login buttons shown on the left of the category page. 

<?xml version="1.0"?>
<layout version="0.1.0">
  <catalog_category_default>
    <reference name="left">
        <block class="Magento\Catalog\Block\Navigation" name="catalog.leftnav" after="currency" template="Magento_Catalog::navigation/left.phtml"/>
        <block class="Mageplaza\Sociallogin\Block\Buttons" name="buttons.sociallogin" template="Mageplaza_Sociallogin::buttons.phtml">
                <action method="setSocialNetworks"><argument="social_networks" xsi:type="string">Google,Yahoo,Facebook</argument></action>
        </block> 
    </reference>
  </catalog_category_default>
</layout>