From a recruiter (edited):
Social media folks, web developers and UX designers don't just sit in front of the computer. They need to be able to sit down at a meeting and advise senior leaders on protocol for a new project.
Or they need to be able to pick up the phone and firmly and tactfully chew-out a vendor partner who's not delivering.
They might have the best portfolio or coding ability on the planet but if they can't interact with others, they aren't a fit for my clients.
So I'm not going waste my time emailing someone who isn't interested in talking with me on the phone. Maybe they're afraid to talk or they're just not used to it but no chat, no opportunity.