Apple and Google share two directors, Google CEO Eric Schmidt, and former Genetech CEO Arthur Levinson. (free subscription required):

The Clayton Antitrust Act of 1914 prohibits a person's presence on the board of two rival companies when it would reduce competition between them.

The story goes on to say that the so-called "interlocking directorates" provision of the Clayton Act, is rarely enforced, but that the FTC has already notified Apple and Google of its interest in the two companies.

Schmidt has been on Apple's board , while Levinson has served on the board since 2000.