Checking some websites that rank on top positions for different keywords I found with some tools that those websites have some links from other websites ,but when the tool that shows you the exact url, where the backlink is coning and you visit that page ,you never find a backlink Have you face that before guys?
It's backlink spamming or cloaking The original way it was used was through your site traffic analytics. You think you were getting traffic from the other site so you create a backlink as a thank you. Or you have your top 3 referrers shown on the site (remember the '90s when that was cool?) and it was an easy way to get on that list. What you are seeing is the same technology with the same goal (SERPs) but a different strategy.