You posted "k.", and then edited it into this comment, but both of those are very low-effort.
If Twitter had no impact on the real world whatsoever, do you think everyone else would be writing so much about it?
That is missing the point; it's not about you are or aren't on Twitter, it's that they are. Twitter encourages contextless "outrage", and things escalate from there. Sometimes justified, sometimes less so.
Is that one they or many they?
Why should I care what they say?
You shouldn't, right up until the point you wrote something that for some reason takes off on Twitter and then you get your unrelated lecture cancelled or your employer gets calls or whatnot. And then you have no choice.