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Download To catch criminals, police worldwide are using social networks, psychological tactics and TV programs. Facebook scans private chatting sessions and posts to catch users who violate its terms of use or seek criminal activities, according to Reuters. The world's largest social networking site immediately calls law-enforcement agencies after it finds and flags users who use its accounts for potential criminal activities, said Jeffrey Duncan, special agent supervisor for the Florida Department of Law Enforcement, in an interview with Reuters. "A man in his early 30s was chatting about sex with a 13-year-old south Florida girl and planned to meet her after middle-school classes the next day," he said. "Facebook's extensive but little-discussed technology for scanning postings and chats for criminal activity automatically flagged the conversation for employees, who read it and quickly called police. Officers took control of the teenager's computer and arrested the man the next day." As long as information goes out on the Internet, "pressing the 'Delete' button cannot remove the information completely," Tang Lan, an expert on information security from the China Institutes of Contemporary International Relations, told China Daily. Four out of five police officers said they use social media platforms to help them with their investigations, according to a survey recently published by LexisNexis Risk Solutions. | 
