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It's up for me, but I never logged out. I've heard from others that it's no longer accepting new logins and may have reached some kind of login cap.

Hmm, weird shows this when I go to: http://steem.herokuapp.com/

Application Offline for Maintenance
This application is undergoing maintenance right now. Please check back later.

That's just a heroku app for letting people join automatically. The actual slack channel is here: https://steem.slack.com/messages/general/ though I'm not sure about new invites.

This just answered my question, thanks! But maybe you can ask in the slack channel and get a definitive yes/no

Just did. I'll report back if I hear anything.

@xeroc just mentioned this in Slack:

devs are discussing to move over to rocket.chat

So hopefully there will more options for everyone soon.

Awesome thanks inquiring!