matrix_jan - 2:04 am on Feb 6, 2013 (gmt 0)

Then you are blocking a huge amount of valid users.

What percentage of users use browsers that don't send referrer data at all? 0.1%? 0.5%? And I'm talking about those cases when you visit a webpage and all the images, css, javascript files are being called as direct access... With my move I get 20% more traffic, so I don't care about that small percentage.