Move over mobile marketing: A little voice is whispering that your time as "the next big thing" is almost up. Actually, that whisper is more of a shout, and it's "Echo"-ing across the digital landscape, as voice-response technology is rapidly emerging as the most disruptive force to hit the industry since the internet became a visual medium. Just how loud will this sonic boom be? If your brand is starting to hear Siri's siren-like call to action, here are some insights and considerations you might find helpful: Research from OC&C Strategy Consultants projects that voice shopping will jump to $40 billion in 2022 (up from $2 billion today). However, the last-touch voice commerce experience has yet to reach the mass adoption levels that retailers like Amazon initially envisioned.