What-is-the-most-crucial-element-for-head-mounted-displays-(e.g.,-Google-Glass)-to-be-socially-accepted?

What is the most crucial element for head mounted displays (e.g., <a href="http://glass-apps.org/google-glass" title="Google Glass">Google Glasses</a>) to be socially accepted? <br/> http://www.quora.com/Google-Glass-4/What-is-the-most-crucial-element-for-head-mounted-displays-e-g-Google-Glass-to-be-socially-accepted