I am not big on football terminology but is diving only when you go down when there hasn't been a foul or is it called diving when you fail to do your utmost best to keep your footing after a foul? If the latter is correct then players dive all the time, because otherwise the referee is likely to let a foul fly. If the former is correct then Robben did not dive, as the defender placed his foot on Robben's foot without touching the ball, which is for all intents and purposes a foul.