Twitter’s hosting provider, NTT America, is upgrading a portion of our internal network starting July 31 at 11PM Pacific.  ( August 1 at 600 UTC) This maintenance will last approximately five hours.  During this time, there may be intermittent periods when some users are unable to use Twitter.  During these intermittent periods you will see the maintenance page (as pictured above) which will link to our status blog where you can read the latest updates on the progress of the maintenance. - FFLobby