User-agent: facebookexternalhit
Disallow: /
Allow: /share

User-agent: Google
Disallow: /
Allow: /share

User-agent: XING-contenttabreceiver
Disallow: /
Allow: /share

User-agent: LinkedInBot
Disallow: /
Allow: /share

User-agent: Twitterbot
Disallow: /
Allow: /share

User-agent: *
Disallow: /