John Varley

In John Varley's upcoming scifi novel Rolling Thunder, everyone has a brain implant that lets them google information constantly. And many futurists are saying this technology will become a reality long before we colonize Mars. The question isn't whether we'll have google brain implants (or the futuristic search engine equivalent), but how we'll handle them. What exactly would be the plusses and minuses of being able to google information instantaneously in your head, without anybody knowing you're doing it?