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What we know so far about Google's 'Mobile First' take on the web: Google rolled out a process of mobile-first indexing to a larger number of sites. The rollout was only for sites that follow what Google described as the best practices for mobile first-first indexing.
This was the first time Google confirmed that it would moving more sites to the mobile-first indexing process. Earlier than that, Google had announced that a select number of sites had already been moved over.
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