A Bob Marley song and the social media power of celebrities like Lady Gaga, Rihanna and Eminem is being harnessed to raise help for the crisis in East Africa.

The "I'm Gonna Be Your Friend" campaign has been launched to raise awareness of the calamity which has left about 10 million suffering through a famine in Somalia due to a blistering drought.

A short film about the crisis was set to the Marley and the Wailers song "High Tide or Low Tide."

Stars like Beyonce, Jennifer Lopez, Justin Bieber and about 150 others have pledged to promote it and the cause on Facebook and Twitter.

The video will be for sale on iTunes, through Bob Marley's Facebook page and the website of the campaign.

Funds raised will be donated to Save the Children.

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