Both Microsoft and Sony said they are working to resolve the issue.
Power has been restored to nearly half of the more than 4,000 PG&E customers affected by an outage in San Francisco Friday morning, a utility spokesman said.
PG&E reports there were still about 17,000 customers in the North Bay without power late Sunday afternoon.
The social networking site with over 1 billion users worldwide says on Monday it made a change to its domain name system setup. The change resulted in some users temporarily not being able to reach the site.
A pair of outages left more than 1,500 customers without power in Richmond, El Cerrito and Redwood City.
Crews were working Friday to reopen blocked roadways, restore power to thousands and repair damage from flooding that forced the evacuation of a Capitola mobile home park.
A power outage left about 27,000 Berkeley PG&E customers without electricity Tuesday, and disrupted service to a pair of Bay Area Rapid Transit stations.