User-agent: Twitterbot
Disallow:
User-Agent: Googlebot
Allow: /$
Disallow: / 
User-Agent: Googlebot-Image
Disallow:
User-Agent: Mediapartners-Google
Disallow:
User-Agent: AdsBot-Google-Mobile
Disallow:
User-Agent: AdsBot-Google-Mobile-Apps
Disallow:
User-Agent: AdsBot-Google
Disallow:
User-agent: Bingbot
Disallow:
User-agent: *
Disallow: /