any news can change the whole impression of bitcoin price. now a day people are create panic if they heared any falling down price. you shouldn't do this actually. after veify the news we should take action.
I think Most of the news that affects Bitcoin prices is news that comes from the government, news that actually fights Bitcoin is like banning from certain countries, declaring it illegal and the like.
and In my opinion, still the quality of the news that really affects the price of Bitcoin, fake news spread by fudder will not affect prices, the question is what is the news? Where does it come from? Is this real?