[(People harmed by G+ policy) * ~1/2] is still O(People harmed by G+ policy) (Also, presumably "half the people you happen to know who joined G+ that you circled" has some selection bias to it.)
[(People harmed by G+ policy) * ~1/2] is still O(People harmed by G+ policy) (Also, presumably "half the people you happen to know who joined G+ that you circled" has some selection bias to it.)