Google is updating its algorithm for evaluating "landing page quality" in an effort to weed out low-quality sites that are linked to from AdWords ads, writes ClickZ. As a result, "over the coming days a small number of advertisers who are providing a low-quality user experience on their landing pages will see increases in their minimum bids," according to the official Inside AdWords blog.

The new algorithm is expected to further restrict "made for AdSense" (MFA) sites, which buy AdWords keywords with a minimum or low bid, then link the ad to a page of AdSense (or other contextual ad program's) links (and not much else) for which they are paid higher per click than what they had paid to drive traffic to the page.

Penalizing such sites helps advertisers that link to quality content, site publishers, and consumers by increasing the relevance of Google's ads, according to Al Scillitani, search marketing manager at Fortune Interactive. But he is also quoted as saying a new issue of concern may be just how, and how appropriately, Google determines relevance.