http://news.yahoo.com/s/ynews/ynews_pl832 See particularly the end of the article:
In February, CQ Politics reported that Rep. Peter Hoekstra, R-Mich., broke a national security embargo when he tweeted the details of a secret congressional trip to Iraq: "Just landed in Baghdad." From
CQ Politics:
Not only did Hoekstra reveal the existence of the lawmakers’ trip, but included details about their itinerary in updates posted every few hours on his Twitter page.
Did we mention that Hoesktra is a ranking member of the House Intelligence Committee? Hoekstra's breach also happened to occur just months after the U.S. Army issued a
report warning that Twitter was a "potential terrorist tool."