This guy clearly was on FB's radar for a while, considering the previous dispute about the extension name. His post is so abrasive, I guess the relationship had never been particularly good.

One big difference is that SocialFixer (my wife uses that and loves it) changed its name from "Better Facebook" when Facebook asked him to. He didn't try to be sneaky, or play dumb by calling it "Better FB (FB stands for Friendly Browser, what what whaaaaaaaaaaaat?)".

i dont think facebooks legal team like their missives being scrutinised as they put the "all rights reserved" disclaimer on each one. if i were to post a copy of their emails, im guessing they could use the DMCA law to get the posts taken down... is an "all rights reserved" signature legally binding?

Regular copyright law perhaps. Unless they protected those emails via some technological mechanism that you had to circumvent to publish, the DMCA isn't relevant.

That said, if nothing else there is a strong argument fair use argument for posting excerpts from the communications along with your rebuttals. It's not my money of course, so I understand the reluctance to do so.

The DMCA isn't relevant if you host your own website - they could sue you for copyright infringement, but that seems unlikely. Of course, IANAL.

As a commenter below said, you would be the one taking the risk, but it would add a huge amount to the credibility of your claim if you posted the legal notices.

Courts have generally found you are completely in your rights to post any legal threats you get.