TripAdvisor LLC, a Newton travel website, said it purchased VirtualTourist.com Inc., which like TripAdvisor focuses on user-generated tourist content, and OneTime.com Inc., which specializes in travel booking comparisons. Terms were not disclosed. Both companies are based in Manhattan Beach, Calif. With the acquisitions, TripAdvisor, owned by Expedia Inc., said its media network now reaches 32 million unique monthly visitors. The company has more than 400 employees, including more than 300 in Newton and Charlestown.
