It started with a stolen Facebook photo attached to an inflammatory profile. It led to online harassment, death threats, and emails to the victim’s boss questioning the victim’s character. But an online personal attack against Graham Cluley earlier this year is one example of how easy it is to use a social network to damage the identity of an individual -- or an entire company.

Cluley’s case shows just how rapidly social networks can spread a smear campaign or personal attack -- and how it can quickly spread to the victim’s professional life. Cluley, who is a senior technology consultant with Sophos, recently met another victim who experienced a similar attack on Facebook, Kerry Harvey. He says it was apparently an acquaintance of Harvey’s who built a phony Kerry Harvey Facebook profile that branded her occupation as a “prostitute,” complete with her cellphone number. (See ID Theft Victim Branded a 'Prostitute' .)

Could such a thing happen to you or employees at your company? You bet. Social networks are the next major attack venue for trolls, spammers, bot herders, cybercriminals, corporate spies -- and even jilted ex-lovers or enemies -- to make money, or just plain wreak havoc on their victims’ personal lives, security experts say.

“It's the easiest way to passively gain intelligence on the largest groups of society and nearly every walk of life,” says Robert Hansen, aka RSnake, founder of SecTheory LLC.

The root of the problem is that social networking sites by nature aren't secure. They typically don’t authenticate new members -- you can’t always be sure that your online friend is who she says she is -- and attackers can easily exploit and capitalize on the “trusted” culture within the social network. Users often don't deploy the security and privacy options that some of these sites offer, either.

Social networking application development tools like OpenSocial and third-party tools on Facebook, for example, can be abused by attackers to readily spread malware or lift personal information. There’s also the very real risk of corporate espionage, with attackers culling tidbits from personal or professional social net profiles to wage targeted attacks on businesses via their employees. And popular Web attacks, like cross-site scripting, can also be used against members of social networks.

And don’t think for a minute that your “private” or closed profile keeps you safe from an attack or potential personal embarrassment, either. “There is no such thing as privacy on the Internet,” says Adam O’Donnell, director of emerging technologies for Cloudmark. “You are only delaying the inevitable information leakage for any content you put online. My recommendation is to treat the Internet as if all content there lasts forever.”

Attacks on social networking sites have only just begun, so think twice before you get too personal with what you post on them, or too loose about accepting and trusting new friends and connections.

“You’re only going to see these attacks on social networks go up,” says researcher Nathan Hamiel, who along with colleague Shawn Moyer recently conducted some relatively simple but scary hacks recently on various social networks that they demonstrated at Black Hat USA and Defcon 16 this month. “We’ve noticed some weird social networking attacks since we did our talk” at those hacker conferences, he says.

Here's a look at the seven most lethal social networks hacks:

• 1) Impersonation and targeted personal attacks

• 2) Spam and bot infections

• 3) Weaponized OpenSocial and other social networking applications

• 4) Crossover of personal to professional online presence

• 5) XSS, CSRF attacks

• 6) Identity theft

• 7) Corporate espionage

Next Page: 1) Impersonation and targeted personal attacks

Kelly Jackson Higgins is the Executive Editor of Dark Reading. She is an award-winning veteran technology and business journalist with more than two decades of experience in reporting and editing for various publications, including Network Computing, Secure Enterprise ... View Full Bio

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