Co-founder Sergey Brin, who made the announcement in a blog Friday afternoon, acknowledged that it is unusual for his company to take stands on issues outside the tech realm. The company "especially" avoids taking stands on social issues, he said, because of the diversity of its workforce.
However, Brin said, "it is the chilling and discriminatory effect of the proposition on many of our employees that brings Google to publicly oppose Proposition 8."
"We should not eliminate anyone's fundamental rights, whatever their sexuality, to marry the person they love," he said.
Brin did not mention whether Google will do anything else to oppose the measure, other than taking a stand.
The official site opposing the proposition includes a long list of backers. No companies are listed there. However, on Thursday, Levi Strauss & Co. and PG&E became co-chairs of the No On Prop 8 Equality Business Council. And in July, PG&E donated $250,000 to the campaign.