User-agent: *
Disallow: /wp-admin/
Disallow: /wp-content/uploads/

User-agent: Twitterbot
Allow: /wp-content/uploads/

User-agent: facebookexternalhit
Allow: /wp-content/uploads/

#WP Import Export Rule
User-agent: *
Disallow: /wp-content/uploads/wp-import-export-lite/