In an announcement on its website, Facebook said the feature would be available on its mobile pages for more than 20,000 OpenTable restaurant customers across North America. It wasn't immediately clear if Facebook would receive any commission from OpenTable bookings. More consumers are accessing Web services using smartphones and Facebook has been adapting its business to benefit from the trend. Shares of OpenTable touched a year high of $74.47 before closing up nearly 8 percent at $74.08 Monday on the Nasdaq.