Some usability specialists are employed by Free Software vendors such as Mozilla, Sun, Red Hat, and Canonical.

有些可用性专家受雇于免费软件品牌公司例如MOZILLA， Sun ，RedHat，Canonical。

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Beyond making ads, todays marketing effort requires technologists, usability experts community managers, retail specialists and sometimes even a mathematician or two.

FORBES: What Makes Digital Marketing Fundamentally Different?