Here’s another inevitable instance of making things easier in the world of Social Media.
Since tweets are limited to 140 characters, you pretty much need to shorten a URL if you are posting a link.
Hence the rise of URL shorteners such as bit.ly and goo.gl.
Twitter now does it automatically. Not only that, it will show your tweeps the destination URL. Which solves this issue.
Here’s the full rundown on it:

Twitter Adds Automatic Shortening for URLs