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Pop up windows come in many different shapes and sizes, typically in a scaled-down browser window with only the Close, Minimize and Maximize commands.
There is a strong resentment by some Web surfers towards pop-up ads. Marketers often do not realize the ill-will generated by pop-ups because it is easier to click the "close" button than send an email to complain. What can often be seen is an above-average click-through rate, although some of this can come from "false positives," unintentional clicks when the pop-up gets in the way of the desired target. Advertisers can get a better picture of the effectiveness of pop-up advertising by paying attention to conversion rates and return on investment (ROI).
Google : No Pop-Up Ads on Google
Google’s policy of pop-up advertising
Are Pop-Up Ads Killing Themselves?
E-Commerce Times (October 28, 2002)
Report: Few Advertisers Use Pop-Ups
E-Commerce Times (September 4, 2002)
EarthLink joins movement to kill pop-up ads
USA Today (August 19, 2002)
Pop-Up Warfare: Is Peace Possible?
ClickZ (August 15, 2002)
Dodging pop-ups with Mozilla
CNET News.com (August 14, 2002)
Why Nix Effective Formats?
ClickZ (August 8, 2002)
The Pop-Up Campaign From Hell
Salon (May 22, 2002)
Pop-Up Ads, Part 2: Usage Guidelines for Legitimate Marketers
ClickZ (March 21, 2002)
Pop-Up Ads, Part 1: Good? Bad? Ugly?
ClickZ (March 14, 2002)
Google Distances Itself From Pop-Ups
CNET News.com (January 29, 2002)
What Pops Up Must Come Down
Wired (July 22, 2001)
Noxious Pop-Up Ads are Gaining Respect
Media Life (April 3, 2001)
Consumers Combat Pop-ups With Software, Tricks
CNET (February 5, 2001)
TheGlobe Tries Pop-up Ads
CNET (Aug 17, 1998)
N.Y. Times Tries Pop-up Ads
CNET (January 16, 1998)
Pop-up Ads OK For Tripod
CNET (December 22, 1997)
GeoCitizens Bristle at Pop-up Ads
CNET (December 18, 1997)