partner-contact/partner_socialmedia/views/res_partner_view.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="view_partner_form_socialmedia" model="ir.ui.view">
        <field name="name">res.partner.form</field>
        <field name="model">res.partner</field>
        <field eval="1" name="priority"/>
        <field name="inherit_id" ref="base.view_partner_form"/>
        <field name="arch" type="xml">
            <xpath expr="//notebook" position="inside">
                <page name="socialmedia" string="Social Media">
                    <group>
                        <field name="facebook" widget="url"/>
                        <field name="twitter" widget="url"/>
                        <field name="skype" widget="url"/>
                        <field name="linkedin" widget="url"/>
                        <field name="mastodon" widget="url"/>
                    </group>
                </page>
            </xpath>
        </field>
    </record>
</odoo>