What it does not tell you
Most accounts have three to five whether or not anybody decided them, and the useful exercise is finding the ones you already have rather than inventing new ones. The number worth knowing is not how many posts each pillar gets but how each performs per post: it is common for the pillar you post least to be the one that reaches furthest, which is an argument for changing the mix rather than working harder on the pillar you like.
Now the harder question. What do yours say?
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