Scammers and spammers are flooding Apple's newly-launched Ping music-related social network with fraudulent messages, says security firm Sophos.
Ping, built in to the latest version of iTunes released this week, is failing to block fraudulent messages.
"The lack of filtering on Ping is making it a brand new playground for the bad guys to operate in," said Graham Cluley, senior technology consultant for Sophos.
Hopefully Apple's security team can extend the rudimentary controls for preventing offensive messages to also block scam messages and malicious links, he said.
"In the meantime, though, Ping users should be wary of believing what they read on the new service," said Cluley.
In February, Sophos published research showing a 70% increase in the number of users reporting spam and malware being spread via social networks.
This trend continues to grow, but as more companies use social networking, they need to think carefully about what they are going to do to make their communities safe, said Cluley.
"If they're complacent about these sorts of security risks then users may end up voting with their feet, and find a safer place to spend their online time," he said.