I noticed that most of the times when the conjunction "so" is used at the beginning of a sentence, it is followed by a comma:
So, this gets published but the fact that it is inaccurate gets moderated out.
Occasionally, I find sentences with no comma after "so":
So he went to Ishmael and married Mahalath.
I am guessing that whether to put comma or not after the "so" conjunction is related to the context and emphasis rather than to the sentence structure, but I am unable to pinpoint it out.
So when do we need to put comma after "so"? (← Do I need a comma after the "so" here?)
P.S.: I know there is another usage of "so" as an adjective or an adverb, in which case no comma is necessary, for example: "So big is the caravan that it cannot fit into the garage."
P.S.: I did skim through the list of questions with [comma] tag, and found no question on this conjunction yet.