With more than 29 million unique monthly listeners, TargetSpot vaulted to the top of comScore's adjusted February expanded category report for the entertainment radio category. It was the first time TargetSpot was measured by comScore.
TargetSpot—which includes CBS Radio, AOL Radio, Yahoo Music and Live365, among its 75 network distribution partners—reaches more than 64 percent of listeners in the entertainment-radio category and 14 percent of the total Internet audience.
Westwood One's partner sites were ranked No. 2 with more than 27.4 million unique visitors, followed by ReplaceAds (18.6 million), Pandora.com (12.5 million), and Clear Channel Online (9.2 million).
TargetSpot's audience will be measured monthly by comScore.
"The Internet and mobile radio industry is growing rapidly and it is critical to advertisers, media companies and advertising networks to have an independent provider of audience measurement that covers both pure play and broadcast media," said Eyal Goldwerger, CEO of TargetSpot.
Ando Media, purchased last November by Triton Media Group also measures Internet radio.
Some media companies and buyers viewed the aquisition as controversial since the company that purchased the ratings firm also sells in-stream radio advertising.