Bitly (www.bitly.com) is the web service that provides an easy way to save, share and discover links from around the web. In SmartJobBoard it is used to shorten job links for job posting to Twitter because twitter has limitations on the number of symbols allowed per post and too long links do not fit this format.
In order job links in Twitter job posts are shortened correctly you need to set up this service. To set the Bitly go to Admin Panel -> System Configuration -> Social Media > Bitly.
On the opened page you will see the following form:
Make sure to press the "Save" button under the form to save the settings you made.