This. My representative (Adam Schiff) is one of the cosponsors. I find hard to believe that anything a lowly college student can say will seriously affect his chances of changing his vote.
As a Pasadena native I've always known Adam Schiff to be very open to communication with his constituents. However, I can't recall him ever changing his position based on complaints. Also, his district contains cities that employees of several major studios (Universal, Disney, Dreamworks) call home which may help to explain his position.
Remember, he's a politician. He can change just how hard he works to pass the bill based on how many people will hate him if it passes, even if he never flips.
That said, feel free to replace him in the next election, if possible.
Tell him that, as a college student with lots of social connections, if he neuters the internet like this you're going to have a whole lot of spare time--and you'll devote all of it to organizing protests against his re-election and/or any enterprise he chooses to pursue after leaving office.
Do it nicely of course, but basically that's what you should say. Play to your strengths. You don't own a company -- maybe you don't even own a suit -- so you play to a college student's strengths which are social media connections and spare time.