傳媒對於節日商品化和保全節日傳統文化,起了甚麼作用呢? 請列出所持的理據，並以50字或上說明。

Nowadays, the mass media plays an important role in our daily lives, especially during festival seasons. Hong Kong residents like shopping and entertaining during different Chinese or Western festivals. When they decide where to go or where to play, they will get information from the mass media. We can know more about things that are deserved to buy or events that we shouldn't miss from the mass media. It can help us to enjoy ourselves during these festivals. Therefore the phenomenon that the atomosphere of celebrating festivals is filled in different cities all over the world is the mass media's praiseworthy achievement. But on the other hand, some mass media will make reports which are untrue or exaggerated. So we should determine whether the reports are true instead of blindly believing in the mass media.