See issue #395 below. That stops most mobile applications--except those on the iPhone--from using OAuth.<p>See <a href="http://twitpic.com/api.do" rel="nofollow">http://twitpic.com/api.do</a>, <a href="http://img.ly/pages/API" rel="nofollow">http://img.ly/pages/API</a>, <a href="http://code.google.com/p/imageshackapi/wiki/YFROGuploadAndPost" rel="nofollow">http://code.google.com/p/imageshackapi/wiki/YFROGuploadAndPo...</a>, <a href="http://twitrpix.com/api" rel="nofollow">http://twitrpix.com/api</a>, <a href="http://twic.li/api" rel="nofollow">http://twic.li/api</a>. All of them require and/or allow the client app to pass the user's <i>Twitter</i> username and password.