Twitter is an information network made up of 140-character messages called Tweets. It's an easy way to discover the latest news related to subjects you care about.
Create your own background image. However, do not make the image too much like an ad or sales pitch. The background image must be less than 800k and we recommend a size of 1600x1200 for a large image or smaller if you plan on tiling the image or just having it on the left-hand side. Finally, keep in mind that smaller resolutions and monitor sizes hide much of the background.