
Pittsburgh has previously banned indoor furniture that is kept outdoors, in an attempt to minimize the couch burnings (originated at WVU) seen after major events (see, Oakland 2009).Just like in other places (Egypt, Tunisa, Iran) social media plays a role on both sides of the police barriers. From The Pitt News, a student named Ralph Johnson shows that he really doesn't understand Google cache:
“The Riots Will Continue!” Ralph Johnson, a freshman, posted (on Facebook).
“As young students at a large university, I feel as if a large, chaotic celebration is imminent. A lot of kids are going to be engaged in drinking and out of the excitement, it’s definitely not out of line to say people are going to be going crazy,” Johnson predicted.
Other people advocated Dumpster fires on Forbes Avenue, climbing traffic lights and burning couches.

I think it's probably smart to remove the outdoor couches in Oakland. It may be counter-productive to say, Don't Burn Couches. (see previous post)
What I really wonder about is the police presence.
From The Pitt News, Police Set For Sunday:
More than 400 extra police officers from the city, county, state and University department will also be on hand to maintain order, according to city police security plans.
In 2009, there were problems in Oakland after the Super Bowl. What's going to be different this year? A big difference is, now the police have had paramilitary G-20 experience in Oakland. (OC Gas, rubber bullets).

Don't worry about it.