The Great Server Crash is a nick name used by ifunny users for the mass-banning in 2013.
In 2013, ifunny became infiltrated with NSFW accounts and Kik accounts. Every other collective post was either NSFW or someone asking people for their kik. This lead to Chef adding a feature to the Reporting system that let users report someone for posting their kik.
Now, if you post your kik, the post will likely be removed within the hour however you will not be banned. For NSFW accounts, the chance of being ban within a day of making the account is almost 100%.