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i have some web on top page of Google, i want to know if i put some ad on my homepage e.g. Amazon ad, ebay ad, is that will influence my rank？ will google tank my rank? how serious will be? anybody have experience with it?

i have a web on top page for sell something, i want to show some Amazon ad to earn some money from sending traffice to Amazon. but how to apply an ad from Amazon? what's the procedure for that? is that need an America credit card to get service paid from Amazon? could you give some simple steps...

I think the next generation of SEO software will be more wise, and can look webpage like human, and and follow the habit of how human to register and post articles. there will no platform difference, all platform are same to human being when register and post, so next generation software will be...