Email ist sexy, Email ist persönlich, Email ist sozial!

Let me preface this discussion by saying that I've been involved in online social networks since the 1980s, when they were dial-up bulletin-board services. I've spent more informal time on them than most people, and I've made them part of my profession for well over a decade. Because of this, I get asked one question quite a lot: What's the best social network?

The truth is that the best social network is the one that benefits you the most.

What is beneficial may differ, depending on your business. If you're a home-improvement company, you might get more out of Pinterest. If you're a musician, you'll love Soundcloud. Google+ is loaded with photographers.

But none of those networks are the sexiest. Instead, your e-mail inbox is the most powerful and alluring network that exists.