With Twitter capping our tweets at 140 characters, many of us have had to find creative ways to make sure we can say what we want to say, without going over the character limit. Want to include a long link in your tweet? Forget about it. But thanks to some handy URL shortening sites, you can include all the links you want (well don't go overboard) . . . It's amazing what you can cram into 140 characters!