CSS Sprites are a way to make your web pages faster. A sprite combines multiple background images into a single image. This reduces the number of downloads in the page. Most major websites use sprites, but they're a pain in the neck!
This icon set consists of 30 (16×16) finely crafted social media icons. They are free to use non-commercially. Put them on your blog or on your website to help users bookmark or share your site socially. I hear its all-the-rage these days.