PALO ALTO, Calif. ( TheStreet) -- Some Facebook users had problems gaining access to the social networking Web site or to some of its functions Saturday. A statement on Facebook's site blamed the problem on "an isolated server issue" and said the company was working to restore access as soon as possible. > > Bull or Bear? Vote in Our Poll Users in the U.S. and other countries had reported problems starting Saturday morning, and many of them used another social networking service, Twitter, to complain, according to the Associated Press. Privately held Facebook of Palo Alto, Calif. has more than 400 million users around the world. -- Written by a member of TheStreet.com staff.