I found a similarity between them.
I delete my Spam (old habits die hard) from time to time and that’s when I click on Google Buzz (I hate the number 100+ next to it). As I do this, I realized I am as impersonal to Google Buzz (no offense to people who love Google Buzz) as I am to spam.
Next time you are launching a great feature/application, ensure that your customers think it is a cool feature as well (heard of crowdsourcing?).