SAN FRANCISCO -- Seattle-based iLike, the popular music program on the Web and on Facebook, said today that it is partnering with Billboard, the music chart provider, to create a new music chart based on social media.

The chart will be based on the massive volume of daily music activity that iLike tracks across the Internet. The weekly charts will reflect which songs are most popular each week among iLike users on Facebook and iLike's desktop software, which users add to their iTunes and Windows Media collections.

Billboard will also give newsfeeds to iLike's more than 4 million users.

Billboard will have two weekly charts based on the listening habits of registered users on iLike.com and Facebook. The first chart will report on the week's top 25 songs "most added" to Facebook user profiles. The second chart will leverage iLike's popular desktop plugins for iTunes and Windows Media Player to monitor the top 25 songs that consumers are adding to their personal music libraries on their desktops and iPods.