OK, one more time. Whether news is "material" or not has nothing to do with its announcement. Here's what the SEC has to say about "material" and "non-public"
" Information is material if "there is a substantial likelihood that a reasonable shareholder would consider it important" in making an investment decision.38 To fulfill the materiality requirement, there must be a substantial likelihood that a fact "would have been viewed by the reasonable investor as having significantly altered the 'total mix' of information made available."39 Information is nonpublic if it has not been disseminated in a manner making it available to investors generally."
No qualification as to who makes it public nor does its materiality hinge on whether it's public or not. A message board is not a proxy for the company, and you, or anyone, can speculate as to what you think may happen or even "a friend of a friend overheard that ...". People reading the board can do what they want with that information. The poster may be liable for trading on news that he or she made public or they may be liable to the company for leaking private information, but someone reading a message board and acting on what they cannot know is true or false information - not an issue.
There is certainly a line between speculation and company provided information, but to say that speculation is "material non-public information" and subject to "insider trading" regulation is just plain wrong, IMHO.