An electronic privacy group has a word of warning: watch what you tweet. Oh, and keep a close eye on your Facebook wall. Why? Well, the Department of Homeland Security might soon be watching–monitoring social media sites like Twitter and Facebook. What are they looking for? Not necessarily signs that you might be involved in terrorism.

Instead, they're reportedly interested in information that "reflects adversely" on DHS itself. "It's very frightening," legal analyst Paul Callan told Erin Burnett. "They seem to be going into a new area."

Homeland Security revealed in January that it regularly monitors social media sites, blogs, and Wikipedia. The mission, a government document explained, was to "collect information used in providing situational awareness and establishing a common operating picture." Adding searches of your Facebook posts and blog comments for negative comments about DHS, Callan says, is legal–since the government would only be reading what's available to anyone.

"But the question is, does it chill political speech? Is it repressive?"