Yes, talking about or inserting something into conversation is promoting. It's advertising. And guess what--almost none of your users or buyers are going to say a word about your product.
People need to stop believing this stuff and just accept the dirty fact that if you want something to get used, you HAVE to advertise. You HAVE to promote.
Edit: You know what word of mouth is? Worthless for people who don't have eyeballs on a product.
Go read around HN and tell me about a product you just heard about being praised that you don't already know about today that is not already the de facto solution or product in a space.
You know what word of mouth is? Word of mouth is a signal you have already won. It is absolutely nothing for growth.