Facebook - No dollar amounts listed but "If we pay a bounty it will be a minimum $500"

Amazon and Netflix, no dollar amounts listed

Microsoft offers up to $250k for "Critical remote code execution, information disclosure and denial of services vulnerabilities in Hyper-V"

Ironically that google page dumped a bunch of html into my browser, including a "script nonce" and a function definition:

    (function(H){H.className=H.className.replace(/\bgoogle\b/,'google-js')})(document.documentElement)

I'll be waiting for a cheque from them, I suppose.