(CNN) -- If you're on Facebook, Twitter or any other social networking site, you could be the next victim.



Experts say cybercrooks are lurking just a mouse click away on popular social networking sites.



That's because more cyberthieves are targeting increasingly popular social networking sites that provide a gold mine of personal information, according to the FBI. Since 2006, nearly 3,200 account hijacking cases have been reported to the Internet Crime Complaint Center, a partnership between the FBI, the National White Collar Crime Center and the Bureau of Justice Assistance.



It starts with a friend updating his or her status or sending you a message with an innocent link or video. Maybe your friend is in distress abroad and needs some help.



All you have to do is click.



When the message or link is opened, social network users are lured to fake Web sites that trick them into divulging personal details and passwords. The process, known as a phishing attack or malware, can infiltrate users' accounts without their consent.



Once the account is compromised, the thieves can infiltrate the list of friends or contacts and repeat the attack on subsequent victims. Social networking sites show there is ample opportunity to find more victims; the average Facebook user has 120 friends on the site.



"Security is a constant arms race," said Simon Axten, an associate for privacy and public policy at Facebook. "Malicious actors are constantly attacking the site, and what you see is actually a very small percentage of what's attempted."



As some social networking sites experience monstrous growth, they are becoming a new -- and extremely lucrative -- frontier for cybercrime. Facebook says it has 300 million users, nearly the size of the U.S. population, and it continues to attract users outside the college student niche. From February 2008 to February 2009, Twitter, a micro-blogging site where users post 140-character messages known as tweets, grew 1,382 percent to more than 7 million users.



"They [cybercriminals] are very adept to using social engineering," said Donald DeBold, director of threat research for CA, an Internet security company. "Your friend is in trouble traveling in another country, 'I lost my wallet. I need help.' They exploit the curiosity aspect out of human nature."



A few decades ago, malicious software and viruses were usually the result of a prank, but Internet security experts say today's attacks are profit-driven. A study from the Indiana University in 2005 discovered that phishing attacks on social networks operated with a 70 percent success rate. These users had fallen for the scam, opened the foreign link and released personal information.



Cybercriminals are employing phishing and malware attacks for a number of reasons, including trying to redirect users to sites where profit is fueled by the number of visitors. They also try to elicit private information like passwords and bank account numbers to perform scams.



Early this year, Twitter experienced several phishing attacks in which a Web page that looked identical to the widely recognized light blue Twitter page was a hoax. The company warned users to double-check the URL to ensure they were visiting the correct site.



The Internet Crime Complaint Center received more than 72,000 complaints about Internet fraud in 2008 that were referred to law enforcement agencies for further investigation. These cases involved financial losses amounting to $264.6 million, an increase from 2007. Each person lost an average of $931.



"Most of us would want to help a friend in need, but if it's an online friend, and they want you to wire money, you should double-check," FBI spokesman Jason Pack said.



Security experts said it makes sense that cybercriminals are turning to social networking sites. Personal information is abundant on sites like Facebook and MySpace. Each time users give out valuable information like birth dates or addresses, they could be providing hints about their password, security experts say.



The American Civil Liberties Union has expressed concern about the information visible through Facebook quizzes and applications.



"They'll have access to all that information, so they can sell it, they can share
What was the amount of losses in 2008 What was the number of accounts hijacked since 2006 How many accounts of account hijacking cases have been reported by the FBI?
amounting to $264.6 million, nearly 3,200 3,200
question: What was the amount of losses in 2008, answer: amounting to $264.6 million, | question: What was the number of accounts hijacked since 2006, answer: nearly 3,200 | question: How many accounts of account hijacking cases have been reported by the FBI?, answer: 3,200