It'll cut down on piracy. The legislation's main purpose is to stifle the proliferation of piracy, which is a noble pursuit. Though many indulge in file sharing services, most only do so out of convenience. If it were to end, they'd return to more legitimate services such as the iTunes Store. Only a vocal minority actually believes all information should be free and that any effort to cut down on a practice that hurts our weak economy should be squelched. These people tend to be either teenagers who have not yet taken Economics or jobless manchildren who do not understand the importance of a healthy economy.
It'll cut down on cyberbullying. The most vicious cyberbullying occurs on rogue websites such as 4chan and kuro5hin. Members of these communities are so vicious in their harassment that it has led to actual suicides. Cyberbullying has become such a threat that movies have been made about it. Surveys have even shown that parents would rather let their children walk alone through Central Park at midnight than let them use the Internet unsupervised. The average citizen does not condone cyberbullying any more than they support real-life bullying. Only the mentally ill view the harassment of twelve-year-old girls as noble and revolutionary as the protagonist on V for Vendetta. If the government had power to shut down such websites, the Internet would be a much safer place rather than the ghetto it's become, and maybe the mentally ill would be forced to find the help they need.
It'll cut down on bullshit. Life is a series of tubes, some of which lead to desolation. There's only a finite amount of time and effort in you, so what you direct down one tube deprives another. The Internet, despite its abundance of information, consists mostly of tubes that lead to a ruined life: pornography, pedophilia, cults, scams, atheism, etc. Imagine an Internet without all the bullshit. Imagine the Internet as a curated experience. Curation offends the average neckbeard, but who woould want to go to a museum where anybody could tack their "art" on the walls. Do you know how much filth, much of which was literal excrement, you would be subject to? Such a museum would go out of business really quick. Curation not only works, but it also works well as the App Store proves. While the news is filled with story after story of Android malware that has compromised millions of unfortunate Android users, the most controversy one ever hears about iPhone apps is when an app contains objectionable material such as shaking a baby. Personally, I'd prefer a store with apps that offend my senses over one that'll clean out my bank accounts. You might not agree, but the majority does. You are in the one percent, and as Spock, a man I'm sure you venerate, once said, "The needs of the many outweigh the needs of the few."
Twitter will still be around. What worries people is that the government will censor dissenting speech and become the totalitarian dictatorship that we see in so many dystopian science fiction movies. It's a ridiculous fear not only because science fiction is fiction, but because services such as Twitter will still be around. As the Iranians learned, Twitter is the best place to fight oppression. If a despotic government couldn't stifle a Twitter revolution, how much more so can one that values the freedom of speech such as ours?
There are many more great reasons to support SOPA. Don't be manipulated by the FUD; it's the same arguments luddites made against ID cards, social security, and photography. Last time I checked, we have our souls intact as much as the neckbeards wearing tinfoil hats.