Question: How Do I Make Short URLs on Twitter?
are very long. Since Twitter updates are limited to just 140-characters, most URLs are just too long to tweet! Fortunately, you can shorten URLs using a free URL shortener. Just copy the URL you want to tweet, paste it into a URL shortener, and voila -- a short URL of approximately 20 characters is returned to you automatically. You can just copy and paste that short URL into your tweet! Follow the link to find a list of popular URL shorteners
as well as a comparison of how short URL shorteners make URLs