Bono has given the creators of Facebook app iLike a sneak preview of U2's upcoming re-release of the Joshua Tree, which will feature previously unreleased tracks.

Wearing his trademark sunglasses Bono, the lead singer of U2, has given fans a rendition of a previously unreleased song via Facebook's iLike application. With U2 set to release a special re-mastered edition of the Joshua Tree next week, he talked through the song "Wave of Sorrow" -- a track which was first demoed during recording sessions for the Joshua Tree album in 1987 but which never made the cut.

The message and announcement of the new unreleased tracks has caused a flutter on Facebook with over 6,000 messages left for Bono's band and over 1.2 million users signed up to the U2 page to receive updates.

At the time of writing the video has yet to appear on the popular social music Web site, MySpace, nor on the band's official Web site. Bono's choice of using iLike over other platforms for giving the exclusive could have been motivated by his business contacts. Marc Bodnick sits on the board of both iLike and a venture capital firm, Elevation -- the same VC firm that Bono is involved in.

The video and future updates from Bono can be found via iLike on Facebook (http://apps.facebook.com/ilike/artist/U2).