Twitter is down at the moment. We started hearing reports about 15 minutes ago. We are watching the Twitter status page, which hasn’t been updated since March 2. We have also reached out to Twitter for comment and will update here if we hear anything.
Postscript (2:24 p.m. Eastern): Twitter updated its status page moments ago with this: “Most users are experiencing issues accessing Twitter on web and mobile apps. We’re looking into it.”
Postscript (2:49 p.m.): Looks like the outage is clearing up, if not entirely. I’m able to tweet via the website and the Mac app. This status page for developers is showing no interruptions, whereas earlier it was showing three.