One tweeter, Graeme Cowie (@woodstockjag), said: "BBC website's down. Proof if any were needed that the public funding model doesn't work".
Another, Alexander Bell (@alexbell_), tweeted: "BBC website...offline...need...banal and irrelevant...magazine features...#endofdays".
Normal service has now resumed on most areas of the BBC website.
A spokeswoman said: "Due to a major technical issue, BBC Online was temporarily down on Wednesday evening. Service was restored to most users within an hour. We are working on full restoration as quickly as possible, and are investigating the causes of the outage."