Brazilian protests: what's going on?

Over the last few days, I’ve been hearing reports of increasingly violent protests ion Brazil. Can anyone explain what these are about? Is it something specific, or is it kind of a generic bitchfest, like the Occupy movement turned into?

I heard something in the news about increased public transportation costs, and that one Brazilian city (no cite) had lowered the price as a result. Of course that may lead to even more demands…

http://www.reuters.com/article/2013/06/21/us-brazil-protests-idUSBRE95K0JU20130621

Here’s Wiki’s article: 2013 protests in Brazil - Wikipedia