Until recently, attacks like the Sammy worm on Facebook simply shut down sites and impeded traffic. However, soon similar attacks will wreak havoc on users' bank accounts as attacks become more complex and organized. This also means that sites like Facebook -- which touts a more professional, white-collar user base, as well as professional networking sites like LinkedIn, will increasingly become targets for organized crime.

"The types of attacks we've already seen, we'll see more of. They'll be better targeted toward monetization," said Brian Chess, founder and chief scientist for Fortify Software. "Along those same lines, having all of your information all there on a site that isn't controlled by users and whose security practices aren't paramount, isn't always the best deal.

While experts say that they can't predict the future, it's likely that social networking sites like MySpace and Facebook will start taking more responsibility regarding their security practices -- especially if users significantly change their behavior or avoid logging on altogether.