Some actors and rock stars use their star power for social activism. But how much power do they really have?Daniel Drezner is a professor of international politics at the Fletcher School at Tufts University in Massachusetts. He says measuring the effects of celebrity activism can be difficult.

He thinks perhaps the most successful example is Princess Diana's campaign against landmines in the nineteen nineties. Yet in the end, he says, it was her death in a car crash that brought more attention to her work and to the issue.

Professor Drezner says celebrity activism can have influence. Star power can bring public attention, donations and pressure for action on important issues. It can also educate fans through stories in the entertainment media.

But at the same time there are risks. Most people will grow tired of an issue, the professor says. And they might also grow tired of a celebrity who keeps talking about it, especially if they think governments are already taking action. Also, when star power is directed at one crisis, others could be forgotten.

参考译文：

一些艺人和摇滚歌星发挥他们的明星效应参与社会行动主义.但是他们真正拥有多少能力呢?Daniel Drezner是一名马萨诸塞州塔斯夫大学的国际政治学教授,他说衡量名人行动主义的作用存在困难.

他认为可能最成功的例子就是戴安娜王妃反对20世纪90年代埋地雷的运动.他说,然而最终还是因为她的车祸丧生,才使人们更加关注她的工作和这个问题.

Drezner教授称名人行动主义可以产生一定的影响.明星效应可以引起公众的关注,得到捐助以及对重大问题的行动施以压力。

但是与此同时也有风险.Drezner教授说,大多数人会对问题产生厌烦.同样他们还会对一个名人不停的谈论同一个问题产生厌烦,特别是当他们认为政府已经正在采取行动的时候.同时，.而且当明星效应被指向一次风波时,该明星的其他方面公信力也将被遗忘

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