Vintage Wallpaper - Film-Fun-1941

PC/MAC: Right-click (ctl+click Mac) on the image, Select "Set As Wallpaper," "Set as Background" or "Use image as Desktop Picture"(Mac) from the fly-out menu.
For best results use "Fit to Screen" or "Fill Screen" (Mac) in your desktop properties.

TWITTER: Right-click (ctl+click Mac) on the image, select Save Image As, and save image to your computer.
Go to your Twitter page and select Settings > Design > Change background Image and upload your wallpaper.