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We use different headlines and text on our mobile site vs. the desktop. Our desktop headlines and text is highly optimized for SEO purposes, but because of user experience and space limitations the headlines and text on the mobile version isn't great for SEO.

I'm wondering, what will google look at and will it make a difference?

Thanks!

I'm trying to build up our external links and am finding lots of opportunities, some of which are on older articles dating back to 2014, 2013 etc. These pieces are relevant to our site and have high DA, I'm wondering if the post date of these articles matter?

Thanks!