Google plans to launch its ad-free subscription YouTube service as early as this year. Video creators recently received a letter from Google explaining the shared revenue plans, the email obtained by Bloomberg. The media agency tells readers that Google is alerting content creators because it needs them to agree to the new terms allowing it include clips in the subscription product.

Here's a little reminder for those working with content and paid-search campaigns. Lisa Raehsler looks at five Web analytics metrics to support paid-search campaigns. She steps through high-revenue keywords, sign-up or cart abandoners, content consumers, and highly engaged. For example, it becomes important to reconnect with consumers who interact with content, so marketers may want to consider tools such as AdWords remarketing lists for search ads. Raehsler explains.

Drawbridge announced the ability to confirm viewability and brand safety metrics across devices. The real-time reports are available from comScore, and Integral Ad Science. The move aims to validate ads served to humans, in-view, and shown on brand-safe inventory. The folks over at Drawbridge believe cross-device viewability has become more challenging than mobile or display viewability alone, as it requires an advanced automated platform to check and recheck metrics.

What happens when your main site doesn't index, but your developer site does, or if you inadvertently change the link structure and URLs without realizing it? Tom Demers runs through the top five most common SEO mistakes and offers suggestions on how to fix them. While the intention is always to improve the Web site, the challenge is knowing what changes to the site may weaken the ability to rank in search engine queries. He explains.

Cindy Krum and Emily Grossman guide marketers through some of the changes they can expect to see later this month after Google makes alterations to its mobile algorithms. The post provides answers to nine key questions about the update, ranging from what happens if the site redirects to a mobile subdomain to how a mobile app might impact mobile rankings. The duo provide detailed answers, but many of the questions will be answered more thoroughly after the changes are launched. 

Google said Monday on Google+ that it has enhanced Keyword Planner to help marketers compare search terms with other advertisers, and plans to roll out the feature during the next few weeks. Searching for new keyword ideas, marketers can review relative ad impressions and compare them with the top five market leaders, as well as similar advertisers in various keyword categories. This helps to prioritize where keyword expansions and identify missed opportunities, per Google.

WikiLeaks rolled out a new home page during the weekend that some believe has a similar look to google.com. The engine's brightly colored letters above the search box and below an "Advanced Search" option gives it away. The home page, however, also lists the latest releases and archives. Venture Beat's Paul Sawers suggests that WikiLeaks creator Julian Assange wants to call attention to his recently released book called "When Google met WikiLeaks."

Google Capital led a $60 million Series B funding round for cloud-based payroll processing startup ZenPayroll. Emergence Capital Partners and Ribbit Capital also participated, along with existing investors General Catalyst, Kleiner Perkins Caufield & Byers, and Google Ventures. The company has now raised $86.1 million at a $560 million post-money valuation for the startup.

Roku has added voice search to its top-tier Roku 3 model, expanding its ability to search for movies and TV shows across multiple streaming services. The feature is activated via a button on the unit's new remote control. It allows users to search for movies, TV shows, actors and directors across about 250,000 movies and TV episodes, and lists by price from top streaming channels. Users can search by channel name, spanning 2,000-plus streaming channels available on the platform such as Netflix, Hulu Plus, Amazon Instant Video, HBO Go, YouTube, Vudu and M-Go.

A shared search feature on Redfin's real estate brokerage Web site enables people who are shopping for homes to collaborate on the process. Anyone using Redfin.com or the Redfin app on their iPhone or iPad can save, share and comment on their favorite homes with co-buyer, real estate agent, friends or family. The list of shared favorites and comments will appear under each person’s profile on Redfin. Hint, hint, retailers. A feature like this would allow consumers buying larger-ticket items for special occasions like weddings or birthdays to collaborate on the decision-making process, even buying the product.