New Links: Does Google Use a Dampening Filter? - Google’s possible purpose for filtering new links
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While Google’s algorithm is not made public, it’s generally thought that Google intends to clamp down on link sales for PageRank and for ranking in the SERPs. Also on Google’s hit list are multiple interlinked sites existing on the same ip c block, entirely for the purposes of link popularity and PageRank enhancement.
Purchased links tend to be added to a website in medium to large quantities, and often all at one time. Large quantities of incoming links, appearing all at once, might indeed trip a filter. Google could consider that a high volume of links added at one time might have been purchased, and therefore suspect. The possibility would be in keeping with Google’s strongly suspected policy of discouraging link sales. After all, Google’s guidelines point out that any type of linking schemes are against its policies.
The ip c block is the third series of numbers in the identity of an ISP. For example, in 123.123.xxx.12 the c block is denoted as xxx. Google is able to readily identify those links. A dampening filter is not only used on such linking schemes, but a penalty filter as well. They are not the type of links that are part of the possible link dampening filter. The alleged link dampening filter is supposedly placing new incoming links in a version of the sandbox.
Google intends links to occur naturally, and with that in mind, their algorithm is apparently designed to reward natural relevant links. Google doesn’t consider purchased links or interlinked sites to be natural, and has provided some indication that they are devaluing them. In the case of interlinked sites, Google is even penalizing sites in much the same way that link farms are given penalties.
By dampening the value of new incoming links, Google probably hopes to discourage link sales in particular. By lessening their value, and removing any immediate link boost, Google might reason that website owners will be less inclined to buy incoming links. The problem lies with the possibility that all incoming links, including natural and relevant ones, are being filtered along with the purchased and non-theme related links.
Google’s intention might be to similar to the alleged sandbox dampening filter for new websites. In both cases, the concern on the part of Google is non-natural links simply to boost PageRank and SERPs positioning. By filtering links, and determining their long term staying power, Google appears to be doling out the link benefits over time.
Google Optimization 
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