Marketers often use the words audience and community interchangeably, but they don't mean the same thing.
It always strikes me as a little misguided to hear marketers talk about their “audience.”
First of all, unless you are a performer or an orator, the people to whom you are hawking your wares are not an audience except in a metaphorical sense.
Second of all, that metaphorical sense itself betrays a misunderstanding of how marketing communication works in the 24/7, surround-sound, socially enabled media environment we all inhabit.
If you are thinking of your current or potential customers as an audience, that implies either that you are broadcasting messages for their entertainment or that they have assembled with the express intent of hearing what you have to say. In both cases, you are mistaken because, on the one hand, your messages aren’t really that entertaining and, on the other, no one actually seeks outmarketing messages.