Die App gibt es nicht mehr.

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Die Server sind nicht mehr erreichbar, auf der englischen Wikipedia steht:

On April 28, 2017, Yik Yak announced it would be shutting down. This followed months of rumors among the app's users about a potential shutdown. Declining popularity of the app became very much noticeable[citation needed], especially after certain changes to the app, such as the mandatory use of handles (handles were later reverted to an optional feature, this was seen as the primary reason for decline[citation needed]) and removal of the "My Herd" feature (which was later reverted also[citation needed]). The app ceased to function as of May 5th, 2017.