i have a site which is second for a good keyword , i would like to know if putting a popup in the site can hinder my SERP . The site does not have adsense on it as it is adult related , so i have thought of putting a popup.
I've used popups before and not had any trouble losing ranking. But that was a while ago and things may have changed. You might do better to do some kind of floating div layer or flash "popup"
Do not use popups......too many people have popup blockers turned on so you may be loosing content to some viewers....consider implementing hidden div's instead....a much more efficient way of using "pop-ups" per say....show div/hide div
I've been considering this situation exactly, adult site and all. I've sent you a PM, I think i might have a worthwhile idea.
My Brother Matt has an un-blockable popup generator. http://forums.digitalpoint.com/showthread.php?t=62009 It is extremely good and is in almost every case, unblockable. It will constitute as part of your on-page SEO though, the way the pop-up works. In otherwords google can read it as part of that page. Brad