Rand Fishkin gives us some tips on how he thinks marketers should react when Google makes algorithmic changes to search results. Start by analyzing the change. It may mean something that affects many sites, rather than something the site might have done wrong. Maybe Google introduced a new feature on page one that changes organic visibility. A list of issues aims to help marketers understand and adjust to the change. Read the article here.

Claire Broadley gives us 50 reasons why Google should penalize Web sites. Describing how both work, she tells us penalties either are automatic or manual, but marketers may not always know the site has been targeted if the cause is algorithmic. Broadley describes what to look for and provides links to other posts suggesting solutions. Read the article here.

Russian's Mail.ru will stop relying on Google to serve queries on its search engine, reports Paul Sawers. Search engines in their respective countries, such as Baidu in China or Yandex in Russia, have begun to focus on becoming more independent. He tells us how Mail.ru will concentrate on building up its technology to support searchers coming to the site for information.

Phil Kowalski provides a check list companies should consider when auditing AdWords accounts. The list walks through campaigns, ad groups, keywords, search queries and more. For example, in the category of ad groups, Kowalski suggests checking the size, topic, and number of ads. Other considerations include conversion tracking, ad extensions and red flags. Read the article here.

Performance marketing agency MediaWhiz said it would combine services and drop the brand Monetizelt, the company's affiliate network, and White Delivery, its email product. TLA, the company's SEO service, has been rebranded MediaWhiz SEO. Read the article here.

The Children's Online Privacy Protection Act Rule went into affect this week, recently updated to keep up with the growing number of kids using mobile devices online. One reason aims to restrict advertising targeted at children and help parents control personal information about their kids, especially those 13 and younger, according to Lisa Vaas. She hopes the new rules lessen the amount of advertising kids "fend off," explaining that Facebook and Google have "pulled off some fancy footwork to get out of having to ask for parental signoff."

Brian Honigman provides a long list of content marketing tools to help marketers get started. He tells us how content helps craft a story or blog post, but don't think strictly images or video. Look at the word choice in blog posts to determine whether the audience will learn something. Here are 50 tools to help get started. Read the article here.

Jessica Lee points to a new feature in Google AdWords that allows marketers to include testimonials as the company's organic search line listings. The feature allows marketers to choose from a direct quote or a summary. She highlights Google's rules for inclusion, points to the ability to add images in extensions, and provides tips on optimizing testimonials. Read the article here.

Paid app sessions continue to grow at 44%, compared with free app sessions at 33%, according to data from Apsalar collected between March 12-13, 2013. It turns out the average revenue per user of free apps rose 38% between March 2013 and the year-ago month. Tero Kuittinen digs through the findings to share his thoughts.

In an ongoing series of how to optimize product listings on comparison shopping engines, Christina Hall explains how to keep up with regular required updates as products change, such as adding new products or those going out of stock. Hall explains how to keep product feeds and listings up-to-date for the best results for merchants and consumers on comparison-shopping engines. Read the article here.