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For example, we all know a redirect can be used for a deceitful "bait and swith" but a redirect can also be used to generate an entry into your logfile whenever there is a clickthrough to a customers site. Just measure the number of such lines in the log to see how many clicks... that's quite harmless. For example:
<a href="/cgi-bin/counter.asp?URL=http://www.advertiser.com" target="_blank">
In the last major Google indexing a site using this click measuring routine has gone from top 20 to a ranking of 250 plus. I am totally baffled as to why and was wondering if this could possibly be the cause.
Is anyone able to offer thoughts on this?
I am considering this on lower level pages. Will I still be penalized?
You shouldn't have any problem with a link of this type. Your linkee might object from concern that this link won't get spidered properly, but it shouldn't cause your site a problem.
On the subject of redirects, it depends whether it's permanent (i.e. a 301), temporary (i.e. a 302) or something else. It also depends on how quick the redirect takes place. Some people say if it's less than 5 seconds then spiders may red flag it back at base, but I'd suggest you may be OK with a redirect (for legitimate purposes, like page moved or such like) automatically after 10-15 seconds, with the link there for human visitors who may not want to wait.