Apparently malware and spam are becoming a bigger and bigger threat on social networks such as Twitter, MySpace, Facebook and LinkedIn.

According to Sophos, security software leader, survey of over 500 firms 57% of users report they have been spammed via social networking sites, an increase of 70.6% compared to last year. 36% of users claim they’ve been sent malware via social networking sites, which is an increase of 69.8% from last year.

I’ll add I have been personally spammed, by what appeared to be links from friends, in FB no less than three times in the last couple months. It’s tricky, like for instance a seemingly innocent link from my old buddy Joe Porcellini of Seeking Alpha fame… that he never knowingly sent to me.

You can read more at Graham Cluley’s blog