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Twitter's announcement today that it will let advertisers target pitches based on words people type in tweets has marketing types in a tizzy over the potential for another ad venue as effective as 's search ads.

Yahoo said its profit rose 36% as the struggling Internet pioneer showed signs of continuing its slow but steady rebound under Mayer. But its shares fell after-hours on signs of decay in sales of display ads.

Seattle-based Atlas is a digital media measurement platform; it provides measurement, analytical and management tools for ad campaigns and marketing agencies.

Every job candidate lives in fear that a Google search could reveal incriminating indiscretions from a distant past. But a new study examining racial bias in the wording of online ads suggests that Google's advertising algorithms may be unfairly associating some individuals with wrongdoing they didn’t commit.

The two-year-old drive to give consumers a simple way to block companies from tracking their behavior as they move across the Internet has faltered, say participants in the process who are struggling to reconcile privacy concerns with an advertising model that pays for many free Internet services.

Shares in AOL have jumped 14% after the US internet firm reported a sharp rise in advertising revenues. Advertising sales jumped 7% to $340m (£212m), boosting net profit for the third quarter to $20.8m, compared with a loss of $2.6m a year ago.

Amazon says buyers of its new Kindle Fire HD tablet will get the option to turn off the advertisements that appear on its standby screen for $15. The online retailer showed off the tablet last week, and said there would be no option to turn off the ads. That was a departure from Amazon's previous policies. It has shipped Kindle e-readers with "Special Offers" ads on the standby screen, but users could pay to have them turned off.

...There’s also the issue that these mobile ads are completely new. Users don’t know any better and happen to click on them. However, over time (and probably pretty quickly), they will learn to avoid these new ads. When banner ads began in the 1990s, CTRs over 5% were common. They are currently 0.2 – 0.3%.

A commerce site called Limited Run, in announcing that it was deleting its Facebook page, claimed that 80 percent of its ad-clicks on Facebook came from "bots" or automated accounts, and only a fifth from genuine users.

Facebook’s results illustrated a reality for social media: It’s a soft sell medium in which advertising may not be that interesting or relevant to consumers. This is important because it means the revenue potential for social media companies such as Facebook may not be as high as many people assumed.