>Sarcasm can be seen as 'inauthentic' and diminish the immediately perceived value of a piece.
I'd rewrite this as such:
"Sarcasm is seen as 'inauthentic' and diminishes the perceived value of the piece."
>the majority of Gen-Y simply can't process more than 140 characters at a time.
I'd strike 'simply'. It's unnecessarily condescending.
>post-2000
Didn't like it when I wrote^H^H^H^H^Hread it and don't like it now. Clumsy. More forced than I'm comfortable with.