Hip-hop entrepreneur Russell Simmons, AOL founder Steve Case and former rap star MC Hammer are each backing a version of the latest media trend: Building fans' music consumption into their social networks.

The music industry has watched as fans buy less music even though they listen to more of it than ever through a proliferation of outlets on the web.

One of the biggest trends has been for fans, particularly those under the age of 30, to spend hours on social networks to connect with their friends and family. Their music is following them there.

Now Mr Simmons, Mr Case and Mr Hammer have each backed web-based start-up companies that take advantage of social media like popular networking sites Facebook, MySpace and Bebo.

"Music discovery has never really been nailed, but the opportunity to bring a social approach to music by leveraging the networks is huge," Mr Case said. He is backing a company called Qloud (pronounced Cloud) that was founded by two former executives of Time Warner internet unit AOL, Toby Murdock and Mike Lewis.

Qloud is now the second most popular music application on Facebook after iLike. Both allow friends to send music clips to each other and link to Apple's iTunes music download service to buy songs.

Qloud also links to music videos on YouTube and other sites when the user watches a clip through their Facebook page.

"Kids want unlimited music inside their social network," said Mr Murdock. "Music is the great internet application."

News Corp. owns MySpace, YouTube is part of Google and Microsoft has a minority stake in Facebook.

The idea of music as social media and cultural force is part of what attracted Simmons to back the founders of GlobalGrind, a personal web page focused on hip-hop culture that helps the user link to the latest music, news and videos as well as to their social network pages.

Since building the first major hip-hop label, Def Jam, in the 1980s, Mr Simmons has been involved in a range of entrepreneurial and charitable ventures.

"The idea is that we're going to build a way to connect young people," said Mr Simmons in an interview. "We want to have all the social networks up on GlobalGrind."

"There are already plenty of dance videos on YouTube and MySpace, but there isn't one community for these people to express themselves," Mr Hammer said. "DanceJam will provide that."

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