This shortened link is created using a program called bit.ly. The reason I use this service is simple:
1. Bit.ly allows me to shorten the URl, giving me room to get my thoughts out in 140 characters on Twitter.
2. A short link program like Bit.ly gives me access to analytics, so that I may see how many times that link was clicked on.
3. I never have to create a custom link more than once because I can rely on bit.ly for storing my links. It's also easy to search for Tweets I've shortened in the past.
I hope you enjoyed that quick tip. Happy Tweeting!