In my opinion, it is still the quality of news that really affects the Bitcoin price, fake news spread by fudders will not affect the pricing, the question is what is the news? where it came from? Is it real? Most news affecting Bitcoin price are those news came from the government, those news that really made against the Bitcoin like banning from a certain country, declaring it as illegal and the likes of them.
Actually fake news affects significantly since most of the investors in this industry are newbie. We can't blame them because its very hard to distinguish fake news to real news nowadays specially if you will just rely on secondhand sources like internet and t.v. We also can't rely on television because most of the channel network are talking how bad is bitcoin and other crpytocurrency without knowing and reserching first the reality. They just also rely on second hand sources