"Mobile apps are the best hostile-code delivery system ever invented," Schwartau says. "The entire mobile space is in chaos."

The solution: Before you install a new app, do some sleuthing to suss out potential red flags; avoid apps from unfamiliar vendors or sites. "Install Gotcha 1.0 from Bob's App Store?" says Schwartau. "I don't think so."

Threat Level: ORANGE

Facebook is often rightly accused of playing fast and loose with its 500 million members' data. But perhaps the site's worst privacy breach of 2010 was when and data brokers.