There are several reasons to use URL shortening. The free hosting space provided by access Internet Service Providers for its customers may generate an aesthetically unpleasing address. Some web developers on mainstream sites tend to pass descriptive attributes in the URL to represent data hierarchies, command structures, transaction paths or session information and this often results in a URL that contains a large number of characters, is awkward to reproduce and impossible to remember. Copying a URL that is hundreds of characters long can only really be successfully done by copy-and-paste. Trying to type one by hand will be time-consuming and may result in errors. Thus a tiny url is more useful to write in an e-mail message or an internet forum post. On Twitter and some instant-messaging services, there is a limit on the total number of characters that can be used in a message. Using a URL shortener can make it easier to include a URL within a short message. Some shortening services...