'So' at start of sentence

Question

Do you really need to put a comma after the word 'so' at the start of a sentence and, if so, when? Can someone give some examples.

ad123 · Answer

It depends on what context you use "so" in.

"So" as a quantitative measure (No comma necessary): 
e.g. "So many people attended the concert last week!"

"So" indicating causality (akin to "hence", "therefore", "ergo", "thus"). This requires a comma. 
e.g. "So, one can easily assume this is true."

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