While this 10% thing is a lie, supposing that we sudddenly could have 10x more of our brain capacity the great majority of people would still waste their time in social media and wouldn't make much change, in my opinion.
For this to happen, we need a faster medium for our thoughts. I read the brain has evolved to the maximum size it can with our only having a single consciousness. Memories seem unlimited, but if you want increased processing power and the "instant" data you feel now, you'll have to transfer your physical brain to a physical device. Light is faster than neurons.