Acquisition prices:
Twitter
$TWTR: $44 billion (Elon Musk)
$TSLA
Slack: $28 billion (Salesforce)
$CRM
LinkedIn: $26 billion (Microsoft)
$MSFT
WhatsApp: $19 billion (Facebook)
$FB
Skype: $8.5 billion (Microsoft)
$MSFT
YouTube: $1.65 billion (Google)
$GOOG $GOOGL
Tumblr: $1.1 billion (Yahoo)
Instagram: $1 billion (Facebook)
$FB