seen it all before(揭示营销人常犯的错误)，先来看看原文的一段话：
Your audience isn’t as homogeneous as it used to be. That means you have a few choices:
1. Inquire. For a small group, or for important interactions, ask. Ask if they’ve been to your site or read your recent blog posts. Ask if they use this software or that software. Ask if they’ve seen Buckaroo Bonzai or not. Ask if this is the first time in your restaurant (or better yet, let your database tell you).
2. Assume. If you don’t ask, you’re going to have to guess. You can make it clear you’re assuming, which puts the burden on the unclued to keep up, or you can take a huge risk and just assume. This strategy works best for large groups, where hitting a home run with half the audience is probably worth the journey.
3. Punt. Don’t ask, don’t make thoughtful assumptions, just pretend we’re living in a three-channel, all-on-the-same-page universe. I think this is the default setting for most marketers, and quite a mistake.