First of all, what’ an URL Shortening service? URL shortening is a technique used very much lately on the World Wide Web allowing people to create a very short URL and make a web page available on it, in addition to the original address. For example, the page http://www.radupoenaru.com/handle-xml-with-namespaces/ has a length of 54 characters and resulted in the following TinyURL which has a length of 25 characters: http://tinyurl.com/mpjxqb .Half the size, same page pointing to!
But hey! Twitter allows only 140 characters – Need to save two characters in a tweet? You either have to use the SMS language – rework your wording by changing “people” to “ppl” or “for” to “4” for example, or, if you want to include a link, you can use a shorter URL. The natural evolution of shortening websites also followed the shrinking idea : Starting with tinyurl.com who had on its own 11 characters, going to bit.ly 6 characters( only half!!!) and finishing with the newest addition, making URLs look like they were getting just a little too long, when Bit.ly introduced j.mp –only 4 characters wasted.
In May, Twitter’s default built-in short URL service was switched to bit.ly from TinyURL and usage went up exponentially. But with that explosion comes lengthier URLs, so it makes sense that the service would cleverly introduce alternative shorter URLs.
Even if at the moment, the two sister websites appear as though they were completely different services, albeit designed identically. But you can visit and login with the same credentials on both of them – either you choose j.mp or bit.ly you’ll not notice a difference more than design, because they have almost the same platform. You can also add the j.mp bookmarklet and use that URL exclusively.And of course, all the bit.ly URLs also work as j.mp URLs.