The 3d.com URL shortener is a free service that allows you to compress very long URLs, even over 100 characters, by reducing the size to a few.
It's an effective way to save space, and gives the link a more pleasing look, but above all it lets you track the number of clicks you've gained, measuring your effectiveness over time. The click tracking report is under development and will soon be available.
The service can of course be used also outside the 3d.com and 3d.net services. It's best for any kind of social sharing.
Shortened URLs from 3D Shortener are easy to write, copy, share and remember, encouraging a wider spread.