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Or entirely possible they knew about it, dismissed it as "frivolous case" or factored it in the price paid.

Well, clearly it wasn't frivolous, so if they did think that then it would be evidence of them not doing proper due diligence.

I guess it's possible they just didn't care. What's another half billion dollars to facebook?

"It's a speeding ticket. Just pay it." -- paraphrasing Zuckerberg's lawyer in The Social Network

The interesting question is whether FB will indemnify Carmack. $150M is a hell of a speeding ticket.

It's not clear whether Carmack was actually the one to get that fine, sounds like it was Iribe.