U2 Makin' Moolah.

U2: Invest in File Hosting Service

U2's Bono and The Edge have invested an undisclosed amount of money in the file-hosting service Dropbox. In making the announcement, the company Tweeted a photo of the musicians hanging out with the company's co-founders.

Dropbox provides online file storage, but unlike other services, it's designed so users can collaborate on projects rather than share copyrighted material.