`::::::A public medium of communication can be anything. A roadside sign falls into this category. ``A means of mass communication, such as newspapers, magazines, radio, or television`` is not limited to those mediums, ``such as`` is the key here. ``I spent most of my career in advertising`` isn't convincing. Your opinion is based on your own experience in your own field, but that does not necessarily mean that your interpretation of advertising is supported by the wider community. Regarding ``you don't know what you're talking about``, please, be civil. Attacking the integrity of other editors is not affording respect.    `