For a federal agency that has struggled for years to modernize its computer systems, this is pretty impressive, and just a tad worrisome: Sometime yesterday afternoon, a woman named Liz Thompson posted this tweet: "Roh-oh, looking at an email in my spam folder from Federal Bureau of Investigations saying, "Message from FBI." Dare I delete?" Not longer after, @FBIPressOffice replied, "@thisfullhouse Yes, you dare.. and report it to our internet crime complaint center: » link to ic3.gov." Thompson seemed a bit surprised by the interaction, tweeting "They ARE watching," and then, in reply to two friends, "I know, kinda scary ...