Identity theft fraudsters will trawl through sites which allow people to leave their pictures and personal details, finding targets for "phishing" attacks – fraudulent emails aimed at tricking people into revealing credit card numbers.
Hackers will also target people using instant messaging services or making telephone calls over the Internet in 2007, Trend Micro said.
Powerful new mobile phones and portable computers will also be targets as thieves try to bypass tight security to steal emails, documents or contacts, security firm McAfee said.
"Modern mobile phones are in essence miniature portable computers," the company said in its annual crime report. "Mobile devices present a serious challenge."
McAfee warns that spying on businesses will become more sophisticated. Criminals are hiring students to plant as sleepers in companies and huge amounts of data can be removed on small, portable memory sticks.
"Corporate espionage is big business," its report says. "Data is often priceless property. Stealing trade secrets, information or contacts is a lucrative money-spinner for cybercriminals."
Security firms say Internet crime can be hard to combat because it embraces different continents and time zones.