Interviewer: How did you come up with this amazing invention?
Inventor: So I put two paperclips together and . . . .
How many sentences do you hear beginning with the conjunction “so”? Far too many. As Geoff Nunberg of NPR writes, this little word usually ” introduces some background qualification that the question calls out for . . . ,” the backstory the speaker or writer feels compelled to give in order to answer the question. Another post on NPR in reply to a reader question speculates “that the word ‘so’ generally functions as a better verbal pause than ‘um’ while an interviewee may be considering how to phrase their response to a question.”
While I do not think that “um” is an effective (not to say useful) verbal pause, I disagree that “so” functions better. In what way? How is “so” better? It has no more meaning than “um.” Nevertheless, it does have some usefulness: “So is not being used just to fill a pause, it seems, but as a tool for conversation management” (Dictionary.com). I will concede that it is useful for bringing the conversation back to a previous direction. Otherwise, it is an irritating verbal tic picked up from all the usages one hears without discerning whether to perpetuate them.
“So” can be properly used as a conjunction within a sentence to connect thoughts that need connecting, but I highly dislike its use as a sentence starter, and I sincerely hope this trend doesn’t stick.