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Obviously, someone in the FBI Press Office is tracking references to the agency on Twitter and has the authority to respond, an echo of efforts in the private sector by companies like JetBlue to be more responsive to immediate complaints or issues raised by consumers. The agency is also using the service to track more serious matters, like this case of an Oklahoma man who was allegedly issuing violent threats around the "tea-bagging" protests a few weeks ago.
"Obviously, someone in the FBI Press Office is tracking references to the agency on Twitter..."
Are you sure it's actually the FBI? Do you know how easy it is to set up a Twitter account? Do you know how many "official" Twitter accounts...aren't? This is why, as a social media consultant, I highly encourage - at the very least - cybersquatting on every social web site available. You don't want someone spoofing your identity, especially a corporate one.
If the tweet was really sent out as quickly as reported here, I highly doubt it's the actual agency monitoring the tweets...
It is a word recognition software program that does it, it downloads when you are on twitter at one point or another.(just about all the other site's use them now too)