The Who Is Important
You can’t write a single word until you’ve identified your audience.
Learn where your target audience interacts. Plan to reach them there.
You must write with the consumption in mind. That means you not only have to know your audience, but you must know the channel in which they’ll receive the message. And yes, sometimes this means writing the same information five distinct ways.
Write a clear and understandable call to action. (visit website, post picture, enter contest, etc.).