Duolingo, the free language learning service co-founded by Luis von Ahn, said it raised a $45 million investment round led by Google Capital. The company’s previous investors, which include Union Square Ventures, NEA and Kleiner Perkins Caufield & Byers, as well as Ashton Kutcher and Tim Ferris, also participated in this round. It brings funding to $83.3 million and company valuation around $470 million.

Google added Bahasa Indonesia to voice search. The Wall Street Journal reports that it's the latest Google technology to be adapted for this nation of 250 million people, where Internet access remains low but is increasing. Indonesian becomes the forty-sixth language available under voice search, which also includes French, Japanese, Turkish and Hebrew.

Buy buttons are popping up everywhere, from Google to Pinterest. Now Shopify said it will team with Facebook to expand on a test that began last year. It will enable people to search for products and buy them directly in the news feed without having to leave the social network.

Though once a common practice, it may no longer be the best idea to code relative URLs into a Web site. Ruth Burr Reedy tells marketers why. She explains relative vs. absolute URLs and why it's important to know the difference and how to use them. She points to duplicate content as one reason. She also highlights structure and the need for marketers need to possibly recode internal links. Here's why.

Kirk Williams lists the top nine updates he thinks Google Shopping needs, from being able to target to Google’s feed-based product algorithms and user-chosen keywords, to a faster way to create campaigns and ad groups in the UI when going deeper than one ad group. He has seven more. Read on.

Google's Larry Page took the No. 1 spot on Glassdoor's annual report of the 50 most popular CEOs at large U.S. companies. The list recognizes the 50 Highest Rated CEOs at large companies with 1,000 or more employees, determined by their employees. Nike's Mark Parker took the No. 2 spot. Charles Butt at H.E.B., Mark Zuckerberg at Facebook, and Scott Scherr at Ultimate Software rounded out the top five.

Finhas Jhaveri at Allstate Insurance shares best practices for paid search in the insurance industry and provides insight for marketers in any industry to reach their audience and boost profit regardless of their budget. He talks about industry trends as well as the mistakes marketers make and how to avoid them.

While Google and Facebook are looking at ways to bring the Web to the masses, both companies have abandoned plans to build and launch satellites to provide Internet service on continents such as Africa, according to separate reports, citing sources. The reports cite the expense of the projects. Both companies separately are still looking at balloons and drones as an option.

Michelin is launching a new global platform with an open search engine interface to help consumers research tire sizes and types before they buy. The company said it allows visitors one-click access to subjects and features, from tire safety to tire performance. The site also serves as a lead-generation tool, putting consumers in direct communication with a Michelin tire expert.

Paid-search costs differ depending on the state marketers work in. What states cost marketers the most per click? Wordstream dug into data costs and created an infographic showing the most and least expensive states for paid-search advertising based on average local cost per click.