There's a lot of buy-in right now with bitcoin. Because people are seeing the price skyrocket so much, it's made the entire market fairly unstable. People are running huge orders at prices that have never been seen before this week. Since bitcoin isn't backed up by any real-world entity, its valuation is purely what the community thinks it's valued at. Since it's value is tied directly to public opinion, media coverage has huge influences on the price of bitcoin. If forbes does an article stating that bitcoin is the most lucrative investment market, thousands of new orders get placed for bitcoins, driving the price up. If the media says that the bubble is about to pop, they create a self-fulfilling prophecy.