For some time now, our API Status Dashboard has been reporting inaccurate information. Unfortunately this has not given developers a clear picture of what is happening on the platform. Please be assured that we are now working to resolve this as part of the migration to our new dev.twitter.com site.
For the moment, we have removed User streams status information as something broken out from the Streaming API - but this does not mean that there is any change to the availability of the service itself.
Thank you for your patience while we work to bring you a dashboard which provides more useful information in the future.