UPDATE
At 4:40 p.m. EST, Twitter returned. Original story below.
***
According to the site’s developer page the outage is related to the “userstream.” According to Twitter:
User Streams provide a stream of data and events specific to the authenticated user. Note that User Streams are not intended for server-to-server connections. If you need to make connections on behalf of multiple users from the same machine, consider using site streams.
The wonderfully named, DownForEveryoneOrJustMe.com, confirmed the outage.
Comments
Is Twitter Down? What You Need to Know