<https://www.bukandroid.com/#/schema/person/image/>
<http://schema.org/contentUrl>
<https://secure.gravatar.com/avatar/20a28268da4fe8f5f16472fccc698881?s=96&d=mm&r=g>
<https://www.bukandroid.com/cara-kirim-aplikasi-lewat-whatsapp/>