Interesting question with all sorts of implications. Am I immediately bound, for example, by the pronouncement of a rav in let's say, NY or Medinat Yisrael Reishit Tzemichat Ge'ulateinu just because his da'at torah is quickly disseminated with modern technologies? What happens to minhag ha-makom?Isn't local all relative when you are in cyberspace?
I just called the local vaad ha-kashrut and left a message. b'n I'll try to clarify their position.
It is only so if you live in cyberspace. Most of us do not live there but just meet up occasionally. The pronouncements of some rabbi in the ZOE should have no immediate effect on anyone here, and certainly should not over rule the LOR.