This year in May, Google made some changes to how ad rotation works in AdWords, changing it to a 30-day period, at which point AdWords would optimize to show higher performing creatives. After some users expressed concerns, Google announced yesterday that it has made some adjustments. Google says it will expand the even rotation period from 30-days to 90, so there’s a longer testing window for new ads.
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A report by local-mobile ad network xAd has shown some very promising numbers for the mobile search and ad market. The US based Q4-2011 data has been collected from mobile sites and apps that run the ads of xAd as well as the related user behavior taken into account. xAd reported high performance for the ads it served, including click-through rates of seven percent for search and .6 percent for display.
2012 seems to be the year to push Google Plus.
Google usually ignores punctuation and mathematical symbols from a query because it doesn't index them. Recently, Google has updated its search results for queries involving punctuation marks and symbols