I start many sentences by saying, 
"So....."
As if I were in the middle of saying something profound
or pondering an intricate, delicate, or abstruse Question: 
"So... when traveling to Brooklyn
Do you exit Fulton Street station?"
(So here, when I say "so" 
I mean therefore.)

But it is not always so.
(So now meaning true.)
Question:  "So, do you always eat soup with a spoon?"
"I think so." So meaning yes, not true
Nor therefore as before. 
("Yes, of course I eat soup with a spoon you buffoon.")

But.. When I say
"It is soooo good to see you!"
Or, "It is sooo yesterday!"
Sooooo is also so very much like very.

Question: "So, how big is it?"
"So big you can't believe it."
"Sooo big?"
"Yes, that's so."
Meaning, correct. (On whose say so?)