When you know your target runs Internet Explorer, you serve phishing pages to IE users and some boring content to other users, at the server level. We've had th

When you know your target runs Internet Explorer, you serve phishing pages to IE users and some boring content to other users, at the server level. We've had this keep our user tests out of Google Safebrowse and so on. I'm sure similar tricks end up applied to Facebook's UA and "legitimate" marketing sites.