Arbitron has released an analysis of diarykeeper entries for Internet listening to streaming of AM/FM stations online. In the 30-market study, entries for online listening grew in Fall 2006 substantially compared to Spring 2006. The increase coincides with implementation of new instructions on IDing Internet and satellite radio as sources on listening for diarykeepers.

However, online listening to streams of on-air stations still accounts for under one percent of un-weighted quarter hours in the markets studied. Older, male diarykeepers tended to be most likely to listen to Internet streams of AM/FM stations.

Also, 66 percent of the quarter-hours where online listening to an AM/FM station was noted were for local stations. In other words, listening online to local stations that could also be heard over the air. Additionally, 78 percent of those noted that they listen to both the online and over-the-air broadcast of the stations.

Internet listeners were more likely to write down the call letters of a station, though of course AM/FM listeners were more likely to note the frequency. Internet listeners also used the word "Internet" most commonly when crediting stations.

AM/FM radio stations are credited for their Internet listening by Arbitron only if the station’s stream is a 100 percent simulcast (including all programs and commercials, for all of the station’s broadcast hours.). In Fall 2006, 12 percent of stations reported to Arbitron that 100 percent of their programming was simulcast online.