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　　When Carrey found that the police in his community were investigating him for a bank fraud(银行劫案), he escaped to Thailand．For months police agents and detectives couldn't find his 　　1　　 location－until they 　　2　　 his Facebook profile．Private 　　3　　 Carrey's profile was, his list of Facebook friends was not．Using that list, the police were able to find and 　　4　　 him．

　　　　5　　 are the days when the only way to catch a criminal was to 　　6　　 “wanted posters” and crime reports．Now when police want to catch a suspect, they 　　7　　 Facebook for clues about the person's traces．Almost everyone is getting online and using social networking sites 　　8　　 Facebook．They are posting photos of themselves, 　　9　　 the world where they are and what they are doing．Often a suspect has his or her own 　　10　　, with photos and information that are vital to the catch the criminals．Some police departments are also turning to the community for help by creating their own Facebook pages．There, officers post photos so that members of the community can see and 　　11　　 them．

　　Facebook is also helping the victims help themselves．Here 　　12　　 the story, when someone stole a truck from Paul, Paul thought the truck was gone and would never be back．But he posted photos of the truck on Facebook and asked people to keep an eye open 　　13　　 it if they noticed it．The next morning he received a call：Someone 　　14　　 the truck and 　　15　　 the police of it．The thief was arrested, and the truck was returned．

　　Thanks to Facebook, it is making it harder for criminals to 　　16　　 their tracks．When criminals are 　　17　　 on Facebook, they are unknowingly leaving 　　18　　 for police to follow．And when police and victims spread the 　　19　　 about a crime over Facebook, more people can 　　20　　 the search．With the right tip, police just might be able to make an quick arrest．