If you’re going to include a link on Twitter, you should use a service that shortens the long Web address. I use www.is.gd. Simply go the site and paste the long link in — then hit the button and your short link is produced. Copy this and paste it into Twitter — that was you don’t waste your 140 characters of space. You can also find a toolbar application that allows you to do the whole process without leaving the Web page you want to link to.
No, go forth and Tweet properly.