Shortened URL's

Many people are concerned about the safety involved in clicking on shortened URL's that give us no idea where we are going before we click on the link. These are necessary when using some sites such as Facebook and Twitter where users are limited to a certain number of characters in their posts.
Here is an add-on for Firefox that will give you information about a site as you hover over the link.

With the bit.ly Preview Plugin for Firefox, whenever you hover over a bit.ly URL on any web page, we display a tooltip showing the Page Title, Long URL, and any Click Data we have about the page the URL links to. If you hover over another short URL, http://tinyurl.com/5qhkwo, for example, we show the Page Title and Long URL for these links as well.

https://addons.mozilla.org/en-US/firefox/addon/10297