DNS over Twitter
A short-lived social account accepted DNS lookup requests and posted answers, using a platform API as the client interface.
This service accepted a request through a social platform and replied with a DNS answer. It is an example of the protocol escaping its conventional client and server shape.
The endpoint is historical. The exhibit preserves the pattern rather than endorsing a service dependency.
Primary source: https://news.ycombinator.com/item?id=19900808