but on the "spotters forum" it may be slightly news worthy
I appreciate that. But can you imagine how full up and tiresome to trawl through the spotters' forum would become if every diversion was given it's own separate thread? Especially when there is nothing more given by the original poster. Are they asking for a reason for the diversion? Or stating there's a rare chance to see an A340-600 at EGCC?
Things that would be of note/interest to the majority of spotters would be lost amongst countless posting say Aircraft ABC123 diverted to Airport WXYZ.