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7 Ways a Mobile-First Index Impacts SEO

Google is constantly changing how they're indexing and ranking sites. Here's how a mobile-first search index may influence how we approach SEO.

7 Ways a Mobile First Index Impacts SEO

If you don’t like change then the Internet is not for you.

Google is constantly changing how they’re indexing and ranking sites. It’s realistic to expect more changes on the way.

I’ve identified seven insights about a mobile-first index and how that may influence rankings and SEO.

1. Mobile-First Informational Needs Are Changing

It may be inappropriate to generalize what kind of content is best for a mobile-first index. Every search query is different and how it is ranked in Google can be different.

Here is a sample of a few kinds of queries:

  • Long tail queries
  • Informational queries (what actor starred in…)
  • Local search queries
  • Transactional queries
  • Research queries
  • How do I queries?
  • Conversational Search
  • Personal Search

Personal Search & Conversational Search in Mobile

Personal Search and Conversational Search are the latest evolution in how people search. It is driven by mobile searches.

The way people search has changed because they are searching on phones. This must be taken into consideration when creating your search strategy.

Personal Search

According to Google’s page on Personal Searches:

“Over the past two years, we’ve seen an increase in searches that include highly personal and conversational language—using words like “me,” “my,” and “I.”

  • 60% + Growth in mobile searches for “__ for me” in the past two years.
  • 80% + Growth in mobile searches for “__ should I __” in the past two years.

According to Google, Personal Searches fall into three categories:

  • Solving a problem
  • Getting things done
  • Exploring around me

Conversational Search

Conversational search is a reference to the use of natural language in search queries. This means that users are literally speaking to their devices and expecting a natural response.

This is another change in how people search that is changing how we must think of content when creating content.

Many publishers, including Search Engine Journal, have experienced an increase in traffic by refashioning existing content to better meet the needs of mobile users.

According to Google’s web page on Conversational Search:

  • Mobile searches for “do I need” have grown over 65%.
    For example, “how much do I need to retire,” “what size generator do I need,” and “how much paint do I need.”
  • Mobile searches for “should I” have grown over 65%.
    For example, “what laptop should I buy,” “should I buy a house,” “what SPF should I use,” and “what should I have for dinner.”
  • Mobile searches starting with “can I” have grown over 85%.
    For example, “can I use paypal on amazon,” “can I buy stamps at walmart,” and “can I buy a seat for my dog on an airplane.”

Mobile Search Trends Drive Content Relevance Trends

The above kinds of queries for both personal and conversational search are trending upwards and represent a meaningful change in what people are looking for. Content should adapt to that.

Each kind search query can be answered by a different kind of web page, with different content length, with different needs for diagrams, maps, depth, and so on.

One simply cannot generalize and say that Google prefers short-form content because that’s not always what mobile users prefer.

Thinking in terms of what most mobile users might prefer for a specific query is a great start.

But the next step involves thinking about the problem that specific search query is trying to solve and what the best solution for most users is going to be. Then crafting a content-based response that is appropriate for that situation.

And as you’ll read below, for some queries the most popular answer might vary according to time. +For some queries, a desktop optimal content might be appropriate.

2. Satisfy the Most Users

Identifying the problem users are trying to solve can lead to multiple answers.

If you look at the SERPs you will see there are different kinds of sites. Some might be review sites, some might be informational, some might be educational.

Those differences are indications that there multiple problems users are trying to solve. What’s helpful is that Google is highly likely to order the SERPs according to the most popular user intent, the answer that satisfies the most users.

So if you want to know which kind of answer to give on a page, take a look at the SERPs and let the SERPs guide you.

Sometimes this means that most users tend to be on mobile and short-form content works best.

Sometimes it’s fifty/fifty and most users prefer in-depth content or multiple product choices or fewer product choices.

Don’t be afraid of the mobile index. It’s not changing much.

It’s simply adding an additional layer, to understand which kind of content satisfies the typical user (mobile, laptop, desktop, combination) and the user intent.

It’s just an extra step to understanding who the most users are and from there asking how to satisfy them, that’s all.

3. Time Influences Observed User Intent

Every search query demands a specific kind of result because the user intent behind each query is different. Mobile adds an additional layer of intent to search queries.

In a Think with Google publication about how people use their devices (PDF), Google stated this:

“The proliferation of devices has changed the way people interact with the world around them. With more touchpoints than ever before, it’s critical that marketers have a full understanding of how people use devices so that they can be here and be useful for their customers in the moments that matter.”

Time plays a role in how the user intent changes.

The time of day that a query is made can influence what device that user is using, which in turn says something about that users needs in terms of speed, convenience, and information needs.

Google’s research from the above-cited document states this:

“Mobile leads in the morning, but computers become dominant around 8 a.m. when people might start their workday. Mobile takes the lead again in the late afternoon when people might be on the go, and continues to increase into the evening, spiking around primetime viewing hours.”

This is what I mean when I say that Google’s mobile index is introducing a new layer of what it means to be relevant. It’s not about your on-page keywords being relevant to what a user is typing.

A new consideration is about how your web page is relevant to someone at a certain time of day on a certain device and how you’re going to solve the most popular information need at that time of day.

Google’s March 2018 official mobile first announcement stated it like this:

“We may show content to users that’s not mobile-friendly or that is slow loading if our many other signals determine it is the most relevant content to show.”

What signals is Google looking at? Obviously, the device itself could be a signal.

But also, according to Google, time of day might be a signal because not only does device usage fluctuate during the day but the intent does too.

4. Defining Relevance in a Mobile-First Index

Google’s focus on the user intent 100% changes what the phrase “relevant content” means, especially in a mobile-first index.

People on different devices search for different things. It’s not that the mobile index itself is changing what is going to be ranked.

The user intent for search queries is constantly changing, sometimes in response to Google’s ability to better understand what that intent is.

Some of those core algorithm updates could be changes related to how Google understands what satisfies users.

You know how SEOs are worrying about click-through data? They are missing an important metric.

CTR is not the only measurement tool search engines have.

Do you think CTR 100% tells what’s going on in a mobile-first index?

How can Google understand if a SERP solved a user’s problem if the user does not even click through?

That’s where a metric similar to Viewport Time comes in.

Search engines have been using variations of Viewport Time to understand mobile users.

Yet the SEO industry is still wringing its hands about CTR.

Ever feel like a piece of the ranking puzzle is missing? This is one of those pieces.

Google’s understanding of what satisfies users is constantly improving. And that impacts the rankings. How we provide the best experience for those queries should change, too.

An important way those solutions have changed involves understanding the demographics of who is using a specific kind of device.

What does it mean when someone asks a question on one device versus another device?

One answer is that the age group might influence who is asking a certain question on a certain device.

For example, Google shared the following insights about mobile and desktop users (PDF). Searchers in the Beauty and Health niche search for different kinds of things according to device.

Examples of top Beauty and Health queries on mobile devices are for topics related to tattoos and nail salons.

Examples of Beauty and Health desktop queries indicate an older user because they’re searching for stores like Saks and beauty products such as anti-aging creams.

It’s naïve to worry about whether you have enough synonyms on your page. That’s not what relevance is about.

Relevance is not about keyword synonyms. Relevance is often about problem-solving at certain times of day and within specific devices to specific age groups.

You can’t solve that by salting your web page with synonyms.

5. Mobile First Is Not About User-Friendliness

An important quality of the mobile-first index is convenience when satisfying a user intent.

  • Does the user intent behind the search query demand a quick answer or a shorter answer?
  • Does the web page make it hard to find the answer?
  • Does the page enable comparison between different products?

Now answer those questions by adding the phrase, on mobile, on a tablet, on a desktop and so on.

6. Would a Visitor Understand Your Content?

Google can know if a user understands your content. Users vote with their click and viewport time data and quality raters create another layer of data about certain queries.

With enough data, Google can predict it what a user might find useful. This is where machine learning comes in.

Here’s what Google says about machine learning in the context of User Experience (UX):

Machine learning is the science of making predictions based on patterns and relationships that’ve been automatically discovered in data.

If content that is difficult to read is a turn-off, that may be reflected in what sites are ranked and what sites are not.

If the topic is complex and a complex answer solves the problem then that might be judged the best answer.

I know we’re talking about Google, but it’s useful to understand the state of the art of search in general.

Microsoft published a fascinating study about teaching a machine to predict what a user will find interesting. The paper is titled, Predicting Interesting Things in Text.

This research focused on understanding what made content interesting and what caused users to keep clicking to another page.

In other words, it was about training a machine to understand what satisfies users. Here’s a synopsis:

“We propose models of “interestingness”, which aim to predict the level of interest a user has in the various text spans in a document. We obtain naturally occurring interest signals by observing
user browsing behavior in clicks from one page to another. We cast the problem of predicting interestingness as a discriminative learning problem over this data.

We train and test our models on millions of real world transitions between Wikipedia documents as observed from web browser session logs. On the task of predicting which spans are of most interest to users, we show significant improvement over various baselines and highlight the value of our latent semantic model.”

In general, I find good results with content that can be appreciated by the widest variety of people.

This isn’t strictly a mobile-first consideration but it is increasingly important in an Internet where so people of diverse backgrounds are accessing a site with multiple intents multiple kinds of devices.

Achieving universal popularity becomes increasingly difficult so it may be advantageous to appeal to the broadest array of people in a mobile-first index.

7. Google’s Algo Intent Hasn’t Changed

Looked at a certain way, it could be said that Google’s desire to show users what they want to see has remained consistent.

What has changed is the users’ age, what they desire, when they desire it and what device they desire it on. So the intent of Google’s algorithm likely remains the same.

The mobile-first index can be seen as a logical response to how users have changed. It’s backwards to think of it as Google forcing web publishers to adapt to Google.

What’s really happening is that web publishers must adapt to how their users have changed.

Ultimately that is the best way to think of the mobile-first index. Not as a response to what Google wants but to approach the problem as a response to the evolving needs of the user.

Image Credits

Featured Image: Paulo Bobita
All screenshots taken by author

Category SEO Mobile SEO
SEJ STAFF Roger Montti Owner - at

I have 25 years hands-on experience in SEO and have kept on  top of the evolution of search every step ...

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