Big Brother can't watch everything, but he can focus on certain groups like, for example, pedophiles and terrorists. The bad part is that the 'net allows pedophiles and the like to network, the good part is that smart, determined law enforcement can more easily identify and find them.
I always wondered if somebody could cross reference Islamoweb sites, to sites in the area of conflict and try connecting the dots to the terrorists. Like a giant database with cross references to machine isp's and e-mails and sites visited ...... I guess that's what the NSA is all about.....?