Never post the same message across social networks
Your content should be engaging each audiences attention on each platform. Otherwise you’ll never be able to have a real conversation with your followers. Each platform has its own feel and vibe. Knowing what and how your audience is searching on these platforms will dictate what content you distribute to the platform. I remember going to my Grandparents and hearing the same story over and over, I was raised in the south so I was taught to ALWAYS respect my elders, so I would listen like it was the first time I had heard it but imagine being at work and someone tells you a story, then on the way home you hear the same story on the radio, then again at home on the tv, then when you open the book you are reading and the same story is there…get the idea. People engage with the social platforms at different places and times in their day and if they hear the exact same thing from you, they will turn you off.