Word of mouth is people speaking freely about something to other people. As advertising, it s cheap and by God it s effective. And it fills all the criterion of free speech. If I recommend a restaurant to a friend, I m expressing an opinion and providing advertising for that restaurant. John sucked on his lip, resulting in a clicking sound on air.
Advertising is a fair form of free speech.
Turn off your friends. And if you really don t like it, then hey don t believe it. You re exercising free speech by ignoring it. By speaking out against it. Listening to you whack on.