Recently Google URL Shortener (goo.gl) and Wikispaces have both announced that they will no longer be continuing their services. Goo.gl is an URL shortener and as of April 13, 2018 only current users will be able create shortened links. In March of 2019 goo.gl will completely discontinue operations, but previously created links will still continue to redirect.
Wikispaces has recently made a similar announcement, and this may need more immediate action if you would like to transfer over any information on any of your educational or free wikis before they are shut down for good. The closure date for education and free wikis is July 31, 2018 which means you will no longer have access to your site. Here is the link to the steps that will help you export any information you would like to save http://helpcenter.wikispaces.com/customer/portal/articles/2920537-classroom-and-free-wikis.