User-agent: FacebookBot
Allow: /

User-agent: facebookexternalhit
Allow: /

User-agent: facebookcatalog/1.0
Allow: /

User-agent: LinkedInBot/1.0
Allow: /

User-agent: Twitterbot
Allow: /

User-agent: *
Allow: /*.pdf$
Allow: /*.DOC$
Allow: /*.DOCX$
Allow: /*.PPT$
Allow: /*.PPTX$
Disallow: /