On December 2nd, 2013, the endpoint [node:10307, title="POST geo/place"] will be deprecated and will cease to function. This means that Twitter apps will no longer be able to create places via API programmatically. Place creation is used infrequently by third party applications and is generally no longer supported on Twitter. If your application utilizes POST geo/place, you'll want to remove that functionality by December 2nd, 2013. From that date, requests will return with status [node:130, title="410 (Gone) with error code 251"]
Please use this thread to discuss anything related to this endpoint retirement.