For the Obama White House, tweets from reporters are a kind of early warning system. It’s up to Jessica Allen, 24, to sound the alarm.

Allen, whose official title is “media monitor,” tracks journalists’ tweets and flags them in mass emails that land in the in-boxes of more than 80 Obama aides, including chief of staff Denis McDonough, White House counsel Kathy Ruemmler, press secretary Jay Carney and senior adviser Dan Pfeiffer.

The result? Reporters who regularly cover Obama have become familiar with seemingly out-of-the-blue emails or telephone calls from officials taking issue with their tweets — often thoughtfully and constructively, sometimes with obscenity-laced yelps of outrage.

Longtime CBS News White House correspondent Mark Knoller estimates that he’s sent out some 77,000 tweets over the past five years and has received just a few “rockets from Carney.”

“'Rockets’ means a few minutes after I tweet something, I’ll get an email from him” with a complaint, Knoller said. “That’s his job, and I’m happy to hear what he has to say. I don’t take offense at it.”

The result? Reporters who regularly cover Obama have become familiar with seemingly out-of-the-blue emails or telephone calls from officials taking issue with their tweets