Posted by Dr-Pete

Even clinging to the once towering bridge, the only thing Kayce could see was desert. Yesterday, San Francisco hummed with life, but now there was nothing but the hot hiss of the wind. Google’s Mobilegeddon blew out from Mountain View like Death’s last exhale, and for the first time since she regained consciousness, Kayce wondered if she was the last SEO left alive.

We have a penchant for melodrama, and the blogosphere loves a conspiracy, but after weeks of speculation bordering on hysteria, it’s time to see what the data has to say about Google’s Mobile Update . We’re going to do something a little different – this post will be updated periodically as new data comes in. Stay tuned to this post/URL.

If you watch MozCast , you may be unimpressed with this particular apocalypse:

Temperatures hit 66.1°F on the first official day of Google’s Mobile Update (the system is tuned to an average of 70°F). Of course, the problem is that this system only measures desktop temperatures, and as we know, Google’s Mobile Update should only impact mobile SERPs. So, we decided to build a MozCast Mobile, that would separately track mobile SERPs (Android, specifically) across the same 10K keyword set. Here’s what we saw for the past 7 days on MozCast Mobile:

While the temperature across mobile results on April 21st was slightly higher (73.7°F), you’ll also notice that most of the days are slightly higher and the pattern of change is roughly the same. It appears that the first day of the Mobile Update was a relatively quiet day.

There’s another metric we can look at, though. Since building MozCast Mobile, we’ve also been tracking how many page-1 URLs show the “Mobile-friendly” tag. Presumably, if mobile-friendly results are rewarded, we’ll expect that number to jump. Here’s the last 7 days of that stat:

As of the morning of April 22nd, 70.1% of the URLs we track carried the “Mobile-friendly” tag. That sounds like a lot, but that number hasn’t changed much the past few days. Interestingly, the number has creeped up over the past 2 weeks from a low of 66.3%. It’s unclear whether this is due to changes Google made or changes webmasters made, but I suspect this small uptick indicates sites making last minute changes to meet the mobile deadline. It appears Google is getting what they want from us, one way or another.

Tracking a long roll-out

Although Google has repeatedly cited April 21st, they’ve also said that this update could take days or weeks. If an update is spread out over weeks, can we accurately measure the flux? The short answer is: not very well. We can measure flux over any time-span, but search results naturally change over time – we have no real guidance to tell us what’s normal over longer periods.

The “Mobile-friendly” tag tracking is one solution – this should gradually increase – but there’s another metric we can look at. If mobile results continue to diverge from desktop results, than the same-day flux between the two sets of results should increase. In other words, mobile results should get increasingly different from desktop results with each day of the roll-out. Here’s what that cross-flux looks like:

I’m using raw flux data here, since the temperature conversion isn’t calibrated to this data. This comparison is tricky, because many sites use different URLs for mobile vs. desktop. I’ve stripped out the obvious cases (“m.” and “mobile.” sub-domains), but that still leaves a lot of variants.

Historically, we’re not seeing much movement on April 21st. The bump on April 15-16 is probably an error – Google made a change to In-depth Articles on mobile that created some bad data. So, again, not much going on here, but this should give us a view to see compounding changes over time.

Tracking potential losers

No sites are reporting major hits yet, but by looking at the “Mobile-friendly” tag for the top domains in MozCast Mobile, we can start to piece together who might get hit by the update. Here are the top 20 domains (in our 10K data set) as of April 21st, along with the percent of their ranking URLs that are tagged as mobile-friendly:

    1. en.m.wikipedia.org — 96.3%
    2. www.amazon.com62.3%
    3. m.facebook.com — 100.0%
    4. m.yelp.com — 99.9%
    5. m.youtube.com — 27.8%
    6. twitter.com — 99.8%
    7. www.tripadvisor.com — 92.5%
    8. www.m.webmd.com — 100.0%
    9. mobile.walmart.com — 99.5%
    10. www.pinterest.com — 97.5%
    11. www.foodnetwork.com69.9%
    12. www.ebay.com — 97.7%
    13. www.mayoclinic.org — 100.0%
    14. m.allrecipes.com — 97.1%
    15. m.medlineplus.gov — 100.0%
    16. www.bestbuy.com — 90.2%
    17. www.overstock.com — 98.6%
    18. m.target.com — 41.4%
    19. www.zillow.com — 99.6%
    20. www.irs.gov0.0%

I’ve bolded any site under 75% – the IRS is our big Top 20 trouble spot, although don’t expect IRS.gov to stop ranking at tax-time soon. Interestingly, YouTube’s mobile site only shows as mobile-friendly about a quarter of the time in our data set – this will be a key case to watch. Note that Google could consider a site mobile-friendly without showing the “Mobile-friendly” tag, but it’s the simplest/best proxy we have right now.

Changes beyond rankings

It’s important to note that, in many ways, mobile SERPs are already different from desktop SERPs. The most striking difference is design, but that’s not the only change. For examples, Google recently announced that they would be dropping domains in mobile display URLs. Here’s a sample mobile result from my recent post:

Notice the display URL, which starts with the brand name (“Moz”) instead of our domain name. That’s followed by a breadcrumb-style URL that uses part of the page name. Expect this to spread, and possibly even hit desktop results in the future.

While Google has said that vertical results wouldn’t change with the April 21st update, that statement is a bit misleading when it comes to local results. Google already uses different styles of local pack results for mobile, and those pack results appear in different proportions. For example, here’s a local “snack pack” on mobile (Android):

Snack packs appear in only 1.5% of the local rankings we track for MozCast Desktop, but they’re nearly 4X as prevalent (6.0%) on MozCast Mobile (for the same keywords and locations). As these new packs become more prevalent, they take away other styles of packs, and create new user behavior. So, to say local is the same just because the core algorithm may be the same is misleading at best.

Finally, mobile adds entirely new entities, like app packs on Android (from a search for “jobs”):

These app packs appear on a full 8.4% of the mobile SERPs we’re tracking, including many high-volume keywords. As I noted in my recent post , these app packs also consume page-1 organic slots.

A bit of good news

If you’re worried that you may be too late to the mobile game, it appears there is some good news. Google will most likely reprocess new mobile-friendly pages quickly. Just this past few days, Moz redesigned our blog to be mobile friendly. In less than 24 hours, some of our main blog pages were already showing the “Mobile-friendly” tag:

However big this update ultimately ends up being, Google’s push toward mobile-first design and their clear public stance on this issue strongly signal that mobile-friendly sites are going to have an advantage over time.

One other bit of good news: we are actively exploring mobile rank-tracking for Moz Analytics. More details are in this Q&A from MA’s Product Manager , Jon White.

Stay tuned to this post (same URL) for the next week or two – I’ll be updating charts and data as the Mobile Update continues to roll out. If the update really does take days or weeks, we’ll do our best to measure the long-term impact and keep you informed.

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