Philadelphia Rock legend WMMR has that rarest of things: A live overnight host. Why bother? And what does this say about the importance of personalities to radio’s future? Watch or listen to ‘MMR PD Bill Weston as he explains the critical value of talent in making connections with our listeners. Yield on that advantage at your peril, radio. “Personality is everything,” says Bill. Watch: Prefer audio?  Try this: Audio clip: Adobe Flash Player (version 9 or above) is required t