Glenn Beck's syndicator runs a astroturf-on-demand call-in service for radio programs

Premiere On Call, a division of the Clear Channel subsidiary that distributes Rush Limbaugh, Sean Hannity and Glenn Beck, is a service that hires actors to call into radio shows and read a script that purports to be a true story presented by the public. They bind their actors to confidentiality agreements, and disavow any involvement in fraud, saying "Premiere, like many other content providers, facilitates casting--while character and script development, and how the talent's contribution is integrated into programs, are handled by the varied stations."
The actors hired by Premiere to provide the aforementioned voice talents sign confidentiality agreements and so would not go on the record. But their accounts leave little room for doubt. All of the actors I questioned reported receiving scripts, calling in to real shows, pretending to be real people. Frequently, one actor said, the calls were live, sometimes recorded in advance, but never presented on-air as anything but real.

Michael Harrison, the editor of Talkers Magazine, the talk-radio world's leading trade publication, said he knew nothing of this particular service but was not altogether surprised to hear that it was in place. There was, he said, a tradition of "creating fake phone calls for the sake of entertainment on some of the funny shows, shock jocks shows, the kind of shows you hear on FM music stations in the morning, they would regularly have scenarios, crazy scenarios of people calling up and doing pranks."

Radio Daze (via Making Light)

(Image: Astroturf, a Creative Commons Attribution (2.0) image from purpleslog's photostream)