what kind of role do you think famous people play in modern socriety?

Famous people play an important role in modern society.They can easily affect people from a variety of age groups.For example,pop singer Zhou Jielun can affect young students easily because they adore him very much.Sports star Yaoming can also influence those basketball fans.If famous people are keen on public affairs,they can bring good influence.That's why some advertisement agency would like to invite famous people to endorse those ads.Yaoming has endorsed a public advertisement to advocate people not to eat shark fins.It is impressive.I think the role of famous people is important.So I hope more famous people would care about public affairs like environment,social welfare and eco-balance.