Facebook is approaching 700 million members but its growth is slowing and it lost users in the United States and Canada last month, the Inside Facebook website said Monday. Facebook had 687 million members at the start of June, said Inside Facebook, which closely tracks developments and trends at the Palo Alto, California-based social network. Inside Facebook said overall growth at the social networking giant "has been lower than normal for the second month straight, which is unusual." The United States lost nearly six million users in May, Inside Facebook said, falling from 155.2 million at the start of May...