Another popular third-party Twitter client is closing its doors today. MetroTwit started off life as a photoshop concept in March 2010, before being released as a Windows desktop client for Twitter. It has grown in popularity over the years with more than 400,000 Twitter users, but a Twitter access token limit on third-party clients means it will soon no longer function for new users. The MetroTwit team is removing the download links for both the desktop and Windows 8 versions, and the existing apps will no longer be supported or updated with features.