Remember, sites like Facebook get more hits on mobile than they do on desktop. Mobile includes more than phones, it also includes the rapidly expanding tablet

Remember, sites like Facebook get more hits on mobile than they do on desktop. Mobile includes more than phones, it also includes the rapidly expanding tablet form factor. I think it would be wise to understand where your traffic comes from and how your audience consumes what you provide and pick the best solution for you. If 70% of your users access your service over mobile, prioritizing desktop over mobile seems very backward! But that's just me.