This is the second time Facebook Inc. is letting users vote on policy changes. The first time was in 2009 when Facebook was a much smaller, privately held company with about 200 million users.
The vote is over updates the company announced in May, a week before its initial public offering. The changes include new sections explaining how it uses people's information. They open up the possibility for Facebook to start showing people ads on outside websites, targeting the pitches to interests and hobbies that users express on Facebook.
Facebook said in a blog post Friday that it is reviewing the voting process, signaling that it might be time to end it.