Selected answers from the Dumb SEO Questions Facebook & G+ community.
Atish Hemade: Website moving from html to shtml making it responsive. Any impact on SEO or rankings if the website is made in shtml?
PromozSEO: If URL structures change (even the extensions) use 301 page-to-page redirects. Make sure you are not blocking any part of the site (even css and javascripts) from Google. Make use of canonical tags.