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There are two different websites you can check the status.
One show's you directly the Server Status of all Diablo 3 Servers: http://us.battle.net/d3/en/status
The second one might be more interesting for you, because that answers your questions:
The maintenance period has been extended until approximately 3:00 PM PDT
Threats of violence. We take these seriously and will alert the proper authorities.
Posts containing personal information about other players. This includes physical addresses, e-mail addresses, phone numbers, and inappropriate photos and/or videos.
Harassing or discriminatory language. This will not be tolerated.