To increase network security, the district blocks URL shorteners (which includes links from bit.ly). The problem with URL shorteners is that the true link is hidden until you click, which makes it hard for you to verify that it is safe. URL shorteners are used for legitimate reasons, so if the link comes from a trusted source, you can go to https://urlex.org/ and to find the actual link. The URLEX website will "expand" the shortened URL so that you can, after reviewing for appropriateness, go to the site. See the video below to see the process.