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Except both those "really really really old sites " and "middle-aged ones" will likely get dropped-back in the SERP with the Mobile-First Index [webmasterworld.com] if they don't meet the mobile-friendly criteria required by the SEs.
Sure, for mobile searches.Once more... the Mobile-First Index [webmasterworld.com] indexes from the mobile site, not the desktop anymore. So even if you are searching from a desktop, the index is built from the mobile versions. Mobile gets more weight. How much hasn't been disclosed yet.
sites that were designed in the day of simple fluid layouts may be easier to make responsive than, say, sites from half a dozen years ago. Sometimes it can be as simple as tweaking a top menu and blocking a sidebar in CSS when a page is viewed on mobile devices.Agreed.
joined:June 15, 2001
it makes perfect sense for future indexed to rank pages based on their mobile version because as of now mobile is overtaking the desktop.And has for the last year...
Internet usage by mobile and tablet devices exceeded desktop worldwide for the first time in October  according to independent web analytics company StatCounterMobile Surpasses Desktop in Search [gs.statcounter.com]
Once more... the Mobile-First Index [webmasterworld.com] indexes from the mobile site, not the desktop anymore. So even if you are searching from a desktop, the index is built from the mobile versions.
Once more... the Mobile-First Index indexes from the mobile site, not the desktop anymore. So even if you are searching from a desktop, the index is built from the mobile versions.On the other hand, there's this from Google:
"If you only have a desktop site, we'll continue to index your desktop site just fine, even if we're using a mobile user agent to view your site."
"He also assured the audience that Google’s eventual switch to a mobile-first index doesn’t mean that desktop content will stop ranking. 'Mobile-first means mobile first. It only means that we’ll look for mobile content first,' IIllyes said."You seem to read this as
In other words, "mobile first" doesn't mean "mobile only," and from what I've read, "mobile first" has more to do with crawling than with ranking (i.e., it doesn't mean all the mobile pages will be at the top and all of the desktop pages will be after page 50 of the results).This seems to be where you misunderstand what keyplyr and others are saying. Literally no one is saying that SERPs will be structured with all mobile-friendly sites followed by all desktop-only sites. What Google is saying is:
Finally, the apparent motive behind a "mobile first" index was spelled out in Google's original Webmaster blog announcement:This statement concerns the CURRENT state of affairs. It explains the rationale, to wit that mobile searchers are being served pages that may not actually answer the query because of the stripped content. Since mobile is more than half the searches made, they want to flip that so that mobile is served the correct info. It is highly likely that the desktop version will have at least that info, and possibly more.
"...our ranking systems still typically look at the desktop version of a page’s content to evaluate its relevance to the user. This can cause issues when the mobile page has less content than the desktop page because our algorithms are not evaluating the actual page that is seen by a mobile searcher."
EditorialGuy ate you reading the other posts through the thread?