I'll check Ghostery.For a future version: Can you include the detection of Ghostery users? Currently they are not detected even if they decide to block all ad networks.
Also in Beta 1.5.0 the "Show notice every X hours" setting is broken and does not work at all. All users see notices at each reloaded page even if they've dismissed them.
About the X hours setting, may to analyze the permissions to make sure it set correctly?
Just checked that locally and it hides the alert as expected.