1) Mobile usage now accounts for over 40% of internet usage, with smartphones being the primary mobile device, so mobile optimization is essential.
2) Google launched a mobile-friendly update in April 2015 that will impact mobile search results for pages that are not optimized for mobile.
3) To make a page mobile-friendly, content should be readable without zooming, avoid plugins like Flash, ensure taps are large enough, and add a viewport meta tag. Proper redirects and avoiding irrelevant cross-links are also important.
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