If you have
Don't worry, you're not alone.
Time Warner have confirmed that they are aware of a huge outage, and say they are working on fixing it. As Buzzfeed points out, there's a lot of ill will towards the company online due to the failure.
Down Detecter has a map of the service failure, which appears to have began at around 8 a.m.
This map shows where it stands at approximately 1 p.m. E.T.
Google Maps