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I routinely see people limiting their audience by posting messages only on Facebook or some other social media that they interact on. Often times, these same people ignore other social media opportunities and marketing avenues available to them.
For Example:
Joe at The Widget Company is having a sale (Buy 1 Get, Get 1 Free) and makes a post on his favorite social media outlet, Twitter. He reaches his followers on Twitter, Yay !
Here is the Better Way: