Fuzz's suggestion is completely unhelpful and completely correct.
But if you have to, don't try to be on them all. Determine what the end goal is for you and your company and pick the ones that will be most beneficial. What kind of work do you do and products/services do you provide? Certain platforms are more more suitable than others depending on the industry.
You can do one or two accounts well, or 5 or 6 terribly. Focus on a couple. See what works well with them and when/if you want to branch out to others, go for it.
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