# allow major search engines
User-agent: Googlebot
Allow: /

User-agent: Bingbot
Allow: /

User-agent: Baiduspider
Allow: /

User-agent: YandexBot
Allow: /

User-agent: DuckDuckBot
Allow: /

User-agent: facebookexternalhit
Allow: /

# block other crawlers
User-agent: *
DisAllow: /