-The Friendica API aims to be compatible to the [GNU Social API](http://skilledtests.com/wiki/Twitter-compatible_API) and the [Twitter API](https://dev.twitter.com/rest/public).\r
+The Friendica API aims to be compatible to the [GNU Social API](http://wiki.gnusocial.de/gnusocial:api) and the [Twitter API](https://dev.twitter.com/rest/public).\r
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Please refer to the linked documentation for further information.\r