{{ if and (.IsNode) (.Site.Params.images) }}
  <meta property="og:image" content="{{ index .Site.Params.images 0 }}">
{{ end }}

{{ if and (.IsPage) (not .Params.images) (.Site.Params.images) }}
  <meta property="og:image" content="{{ index .Site.Params.images 0 }}">
{{ end }}