阅读下面短文，请根据短文后的要求进行答题。（请注意问题后的字数要求）
[1] When it comes to protecting the privacy of their children，US parents give social networks a failing grade.
[2] Three out of four parents believe social networks are not doing a good job of protecting kids’online privacy. The survey was conducted for Common Sense Media，a nonprofit organization dedicated to helping families surf the world of media and technology. 92 percent of parents said they are concerned that children share too much information online，and 85 percent said they are more concerned about online privacy than they were five years ago.
[3] The poll found a great deal of concern about geo-location services which pinpoint someone’s whereabouts.91 percent of parents said search engines and social networking sites should not be able to share the physical location of children with other companies until parents give authorization.
[4] The results present a clear divide between the industry’s view of privacy and the opinion of parents and kids. Common Sense Media chief executive and founder James Steyer said：“American families are deeply worried about how their personal information is being used by technology and online companies. However， the companies appear to be keeping their heads deep in the sand.”
[5] Technology companies need to step up but parents，children，schools and government also need to do more，he said.“Parents and kids have to educate themselves about ，”he said.“Schools should teach all students and their parents about privacy protection. And finally， policymakers have to update privacy policies for the 21st century.”
小题1:What is the main idea of the passage？(within 10 words)
小题2:Which sentence in the passage can be replaced by the following one？
The survey shows that common people and the industry have different opinions about privacy.
小题3:Please translate the underlined sentence in the fourth paragraph into Chinese.
小题4:Please fill in the blank in the last paragraph with proper words to make the sentence complete.（with in 10 words）
小题5:Please give the readers at least three tips on protecting their privacy on line.（within 30 words）
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