Twitter has introduced a new, secure link-shortening service called t.co. All links shared on Twitter.com or third-party apps will be wrapped with a t.co URL. While links might appear something like this: http://t.co/DRo0trj on SMS, they might appear more based on the domain they are going to on Twitter.com and in third-party apps. So if that link were going to some Amazon page, it might look more like this: amazon.com/Delivering-.